Bloodletter of Aclazotz + Shard of the Nightbringer

Bloodletter of Aclazotz
Shard of the Nightbringer

Requires
Bloodletter of Aclazotz must be on the battlefield. Shard of the Nightbringer must be in hand. Mana needed: 5bbb
Steps
  1. Cast Shard of the Nightbringer by paying 5bbb.
  2. When Shard of the Nightbringer enters the battlefield, it triggers, causing an opponent to lose their entire life total due to Bloodletter of Aclazotz and you to gain that much life.
  3. The opponent loses the game due to having 0 or less life.
Results
Infinite lifeloss for target opponent. Near-infinite lifegain. Target opponent loses the game.

Blitzwing, Cruel Tormentor
22.12% of 208 decks 46 decks
Gollum, Obsessed Stalker
19.27% of 1131 decks 218 decks
Vito, Thorn of the Dusk Rose
8.46% of 2812 decks 238 decks
K'rrik, Son of Yawgmoth
4.66% of 12292 decks 573 decks
Astarion, the Decadent
3.90% of 2513 decks 98 decks
Rowan, Scion of War
2.98% of 7020 decks 209 decks
New Cards (5)
Consuming Corruption
71% of 294 decks +70% synergy
Enduring Tenacity
57% of 21 decks +57% synergy
Pinnacle Monk
57% of 21 decks +50% synergy
Caduceus, Staff of Hermes
57% of 7 decks +50% synergy
Arena of Glory
56% of 27 decks +48% synergy
High Synergy Cards (10)
Exsanguinate
80% of 1787 decks +77% synergy
Gray Merchant of Asphodel
80% of 1787 decks +75% synergy
Exquisite Blood
69% of 1787 decks +67% synergy
Crackle with Power
66% of 278 decks +65% synergy
Crypt Ghast
66% of 1787 decks +63% synergy
Sanguine Bond
66% of 1787 decks +63% synergy
Dark Ritual
72% of 1787 decks +61% synergy
Treasonous Ogre
62% of 278 decks +61% synergy
Bolas's Citadel
65% of 1787 decks +60% synergy
Jaya's Immolating Inferno
58% of 278 decks +57% synergy
Top Cards (10)
Phyrexian Arena
63% of 1787 decks +56% synergy
Feed the Swarm
62% of 1787 decks +52% synergy
Swords to Plowshares
60% of 181 decks +31% synergy
Sign in Blood
58% of 1787 decks +53% synergy
Revival // Revenge
57% of 181 decks +57% synergy
Ocelot Pride
56% of 18 decks +51% synergy
Jet Medallion
55% of 1787 decks +53% synergy
Lightning Greaves
55% of 1787 decks +29% synergy
Judith, Carnage Connoisseur
54% of 149 decks +54% synergy
Debt to the Deathless
54% of 181 decks +53% synergy
Creatures (50)
Vito, Thorn of the Dusk Rose
54% of 1787 decks +51% synergy
Kambal, Consul of Allocation
50% of 181 decks +49% synergy
Hydroelectric Specimen
50% of 6 decks +44% synergy
Creeping Bloodsucker
50% of 1787 decks +48% synergy
Heartless Hidetsugu
47% of 278 decks +46% synergy
Elenda's Hierophant
46% of 142 decks +45% synergy
Vilis, Broker of Blood
46% of 1787 decks +44% synergy
Dread Presence
44% of 1787 decks +43% synergy
Rhox Faithmender
44% of 181 decks +43% synergy
Soul Warden
44% of 181 decks +42% synergy
Sheoldred, the Apocalypse
43% of 1787 decks +40% synergy
Indulging Patrician
43% of 181 decks +42% synergy
Blood Artist
39% of 1787 decks +33% synergy
Vizkopa Guildmage
39% of 181 decks +38% synergy
Ayara, First of Locthwain
38% of 1787 decks +36% synergy
Sorin of House Markov
38% of 34 decks +37% synergy
Shivan Devastator
38% of 278 decks +37% synergy
Suture Priest
37% of 181 decks +35% synergy
Elas il-Kor, Sadistic Pilgrim
37% of 181 decks +34% synergy
Cliffhaven Vampire
35% of 181 decks +35% synergy
Felidar Sovereign
35% of 181 decks +34% synergy
Pontiff of Blight
35% of 1787 decks +34% synergy
Sangromancer
34% of 1787 decks +33% synergy
Twilight Prophet
34% of 1787 decks +32% synergy
Nighthawk Scavenger
32% of 1787 decks +31% synergy
Defiler of Instinct
32% of 278 decks +31% synergy
Ignoble Hierarch
32% of 19 decks +29% synergy
Vein Ripper
31% of 964 decks +30% synergy
Vampire Nighthawk
31% of 1787 decks +30% synergy
The Gaffer
30% of 181 decks +29% synergy
Accursed Marauder
30% of 145 decks +20% synergy
Blood Celebrant
29% of 1787 decks +29% synergy
Nirkana Revenant
29% of 1787 decks +28% synergy
Charismatic Conqueror
29% of 142 decks +26% synergy
Serra Ascendant
29% of 181 decks +27% synergy
Drogskol Reaver
29% of 21 decks +28% synergy
K'rrik, Son of Yawgmoth
28% of 1787 decks +27% synergy
Drana's Emissary
27% of 181 decks +27% synergy
Rodolf Duskbringer
27% of 181 decks +27% synergy
Soul's Attendant
27% of 181 decks +25% synergy
Rakdos, Patron of Chaos
27% of 161 decks +25% synergy
Crackling Spellslinger
27% of 45 decks +26% synergy
Marauding Blight-Priest
25% of 1787 decks +24% synergy
Treebeard, Gracious Host
25% of 16 decks +24% synergy
Hullbreaker Horror
24% of 54 decks +21% synergy
Grim Servant
24% of 347 decks +23% synergy
Doomsday Excruciator
24% of 21 decks +24% synergy
Noxious Gearhulk
23% of 1787 decks +21% synergy
Spark Double
22% of 54 decks +19% synergy
Thrull Parasite
22% of 1787 decks +22% synergy
Instants (50)
Fire Covenant
54% of 278 decks +53% synergy
Comet Storm
54% of 278 decks +52% synergy
Path to Exile
47% of 181 decks +27% synergy
Anguished Unmaking
41% of 181 decks +35% synergy
Defile
40% of 1787 decks +39% synergy
Beacon of Immortality
39% of 181 decks +39% synergy
Storm King's Thunder
39% of 278 decks +39% synergy
Fell the Profane
37% of 337 decks +29% synergy
Assassin's Trophy
37% of 52 decks +30% synergy
Infernal Grasp
36% of 1787 decks +32% synergy
Electrodominance
35% of 278 decks +34% synergy
Counterspell
35% of 54 decks +14% synergy
Waterlogged Teachings
33% of 9 decks +31% synergy
Sink into Stupor
33% of 9 decks +25% synergy
Vampiric Tutor
32% of 1787 decks +23% synergy
Deadly Rollick
32% of 1787 decks +26% synergy
Heliod's Intervention
31% of 181 decks +30% synergy
Bitter Triumph
31% of 1161 decks +28% synergy
Breathe Your Last
28% of 145 decks +27% synergy
Deflecting Swat
28% of 278 decks +20% synergy
Imp's Mischief
28% of 1787 decks +27% synergy
Wither and Bloom
27% of 51 decks +26% synergy
Tendrils of Corruption
27% of 1787 decks +27% synergy
Despark
27% of 181 decks +23% synergy
Erebos's Intervention
27% of 1787 decks +27% synergy
Fracture
27% of 181 decks +25% synergy
Flare of Duplication
26% of 34 decks +24% synergy
Commune with Lava
26% of 278 decks +26% synergy
Brainstorm
26% of 54 decks +15% synergy
Cyclonic Rift
26% of 54 decks +12% synergy
Blood for the Blood God!
24% of 278 decks +23% synergy
Fall of the Titans
24% of 278 decks +24% synergy
Mortify
23% of 181 decks +20% synergy
Teferi's Protection
22% of 181 decks +13% synergy
Crypt Incursion
22% of 1787 decks +22% synergy
Heroic Intervention
21% of 52 decks +7% synergy
Beast Within
21% of 52 decks +2% synergy
Chaos Warp
21% of 278 decks +5% synergy
Cabal Ritual
21% of 1787 decks +18% synergy
Seething Song
20% of 278 decks +17% synergy
Malakir Rebirth
20% of 1787 decks +16% synergy
Generous Gift
20% of 181 decks +8% synergy
Absorb
19% of 21 decks +19% synergy
Void Rend
19% of 21 decks +17% synergy
Dovin's Veto
19% of 21 decks +15% synergy
Mana Drain
19% of 54 decks +11% synergy
March of Wretched Sorrow
18% of 1787 decks +18% synergy
Mortality Spear
17% of 52 decks +17% synergy
Tear Asunder
17% of 52 decks +16% synergy
Rakdos Charm
17% of 278 decks +14% synergy
Sorceries (50)
Toxic Deluge
52% of 1787 decks +44% synergy
Insatiable Avarice
51% of 607 decks +47% synergy
Hell to Pay
45% of 91 decks +43% synergy
Jeska's Will
41% of 278 decks +32% synergy
Demonic Tutor
39% of 1787 decks +27% synergy
Peer into the Abyss
39% of 1787 decks +37% synergy
Night's Whisper
38% of 1787 decks +34% synergy
Reanimate
37% of 1787 decks +29% synergy
Ruinous Ultimatum
35% of 20 decks +33% synergy
Read the Bones
35% of 1787 decks +30% synergy
Cultivate
35% of 52 decks +13% synergy
Apex of Power
34% of 278 decks +34% synergy
Cut // Ribbons
33% of 278 decks +33% synergy
Banefire
33% of 278 decks +33% synergy
Farseek
33% of 52 decks +17% synergy
Song of Totentanz
32% of 278 decks +31% synergy
Fumigate
31% of 181 decks +29% synergy
Rampant Growth
31% of 52 decks +14% synergy
Blasphemous Act
30% of 278 decks +14% synergy
Torment of Hailfire
29% of 1787 decks +27% synergy
Rush of Dread
29% of 607 decks +27% synergy
Diabolic Tutor
27% of 1787 decks +24% synergy
Nature's Lore
25% of 52 decks +10% synergy
Damnation
24% of 1787 decks +20% synergy
Three Visits
23% of 52 decks +11% synergy
Kodama's Reach
23% of 52 decks +8% synergy
Damn
23% of 181 decks +19% synergy
Blood Tribute
22% of 1787 decks +22% synergy
Farewell
22% of 181 decks +15% synergy
Pest Infestation
21% of 52 decks +20% synergy
Research the Deep
20% of 54 decks +20% synergy
Grim Tutor
19% of 1787 decks +17% synergy
Blood Tithe
19% of 1787 decks +19% synergy
Vandalblast
19% of 278 decks +11% synergy
Devil's Play
18% of 278 decks +18% synergy
Skyshroud Claim
17% of 52 decks +13% synergy
Ponder
17% of 54 decks +10% synergy
Profane Transfusion
16% of 1787 decks +16% synergy
Lavalanche
16% of 19 decks +16% synergy
Culling Ritual
15% of 52 decks +13% synergy
Bubbling Muck
15% of 1787 decks +14% synergy
Mutilate
14% of 1787 decks +13% synergy
Tendrils of Agony
14% of 1787 decks +14% synergy
Bala Ged Recovery
13% of 52 decks +9% synergy
Repay in Kind
13% of 1787 decks +13% synergy
Death Grasp
13% of 181 decks +13% synergy
Kaya's Wrath
13% of 181 decks +12% synergy
Beseech the Queen
13% of 1787 decks +12% synergy
Damnable Pact
12% of 1787 decks +11% synergy
Mana Geyser
12% of 278 decks +8% synergy
Utility Artifacts (31)
Aetherflux Reservoir
49% of 1787 decks +45% synergy
Bontu's Monument
47% of 1787 decks +45% synergy
Swiftfoot Boots
45% of 1787 decks +16% synergy
Alhammarret's Archive
39% of 1787 decks +37% synergy
Demon's Horn
32% of 1787 decks +31% synergy
Brotherhood Regalia
31% of 32 decks +11% synergy
Whip of Erebos
30% of 1787 decks +28% synergy
Staff of the Death Magus
25% of 1787 decks +25% synergy
Tainted Sigil
23% of 181 decks +23% synergy
The One Ring
20% of 1787 decks +11% synergy
Sensei's Divining Top
19% of 1787 decks +13% synergy
Prism Ring
17% of 1787 decks +17% synergy
Well of Lost Dreams
17% of 1787 decks +15% synergy
Cosmos Elixir
12% of 1787 decks +11% synergy
The Great Henge
12% of 52 decks +7% synergy
Wayfarer's Bauble
11% of 1787 decks +0% synergy
Expedition Map
11% of 1787 decks +7% synergy
Mithril Coat
10% of 1787 decks +3% synergy
Archaeomancer's Map
9% of 181 decks +7% synergy
Quietus Spike
9% of 1787 decks +8% synergy
Pact Weapon
8% of 1787 decks +8% synergy
Whispersilk Cloak
8% of 1787 decks +5% synergy
Bilbo's Ring
8% of 1787 decks +7% synergy
Venser's Journal
8% of 1787 decks +7% synergy
Mask of Griselbrand
6% of 1787 decks +6% synergy
Strionic Resonator
6% of 1787 decks +3% synergy
Commander's Plate
6% of 1787 decks +3% synergy
Thousand-Year Elixir
6% of 1787 decks +3% synergy
Shadowspear
5% of 1787 decks +2% synergy
Elixir of Immortality
5% of 1787 decks +4% synergy
Ashnod's Altar
5% of 1787 decks -3% synergy
Enchantments (50)
Smothering Tithe
38% of 181 decks +26% synergy
Necropotence
36% of 1787 decks +34% synergy
Boon Reflection
33% of 181 decks +33% synergy
Black Market Connections
33% of 1787 decks +28% synergy
Font of Agonies
32% of 1787 decks +32% synergy
Greed
31% of 1787 decks +30% synergy
Cleric Class
30% of 181 decks +29% synergy
Warleader's Call
27% of 11 decks +24% synergy
Wound Reflection
26% of 1787 decks +25% synergy
Blind Obedience
25% of 181 decks +22% synergy
Ghostly Prison
25% of 181 decks +20% synergy
Authority of the Consuls
25% of 181 decks +23% synergy
Propaganda
22% of 54 decks +17% synergy
The Meathook Massacre
21% of 1787 decks +18% synergy
Moldervine Reclamation
19% of 52 decks +17% synergy
Sylvan Library
19% of 52 decks +13% synergy
One with the Multiverse
19% of 54 decks +18% synergy
Rhystic Study
19% of 54 decks +5% synergy
Necrodominance
18% of 313 decks +16% synergy
Bloodchief Ascension
17% of 1787 decks +16% synergy
Captivating Glance
17% of 54 decks +17% synergy
Descent into Avernus
16% of 278 decks +15% synergy
Animate Dead
16% of 1787 decks +11% synergy
Return the Past
14% of 278 decks +14% synergy
Land Tax
13% of 181 decks +10% synergy
Trudge Garden
12% of 52 decks +11% synergy
Axis of Mortality
11% of 181 decks +11% synergy
Rising of the Day
11% of 278 decks +8% synergy
Black Market
11% of 1787 decks +8% synergy
Revenge of Ravens
10% of 1787 decks +9% synergy
Life Insurance
10% of 181 decks +10% synergy
Palace Siege
9% of 1787 decks +9% synergy
City on Fire
9% of 278 decks +7% synergy
Mind's Dilation
9% of 54 decks +9% synergy
Havoc Festival
9% of 278 decks +9% synergy
Test of Endurance
9% of 181 decks +8% synergy
Polluted Bonds
9% of 1787 decks +8% synergy
Kaya's Ghostform
9% of 1787 decks +6% synergy
No Mercy
8% of 1787 decks +7% synergy
Underworld Dreams
8% of 1787 decks +7% synergy
March of the Canonized
8% of 142 decks +7% synergy
Phyrexian Reclamation
8% of 1787 decks +6% synergy
Call of the Ring
8% of 1787 decks +5% synergy
Journey to Eternity
8% of 52 decks +7% synergy
Garruk's Uprising
8% of 52 decks +1% synergy
Warlock Class
8% of 1787 decks +7% synergy
Painful Quandary
7% of 1787 decks +6% synergy
Arcane Adaptation
7% of 54 decks +7% synergy
Aqueous Form
7% of 54 decks +5% synergy
Kindred Discovery
7% of 54 decks +4% synergy
Planeswalkers (9)
Sorin Markov
24% of 1787 decks +23% synergy
Sorin, Vengeful Bloodlord
14% of 181 decks +14% synergy
Kaya, Intangible Slayer
14% of 181 decks +13% synergy
Vraska the Unseen
13% of 52 decks +13% synergy
Liliana of the Dark Realms
12% of 1787 decks +11% synergy
Vraska, Golgari Queen
10% of 52 decks +9% synergy
Sorin, Grim Nemesis
9% of 181 decks +9% synergy
Professor Onyx
8% of 1787 decks +7% synergy
Jace, the Mind Sculptor
7% of 54 decks +7% synergy
Utility Lands (44)
Cabal Coffers
61% of 1787 decks +55% synergy
Bojuka Bog
50% of 1787 decks +35% synergy
Reliquary Tower
44% of 1787 decks +15% synergy
Urborg, Tomb of Yawgmoth
44% of 1787 decks +33% synergy
Cabal Stronghold
43% of 1787 decks +42% synergy
Vault of the Archangel
39% of 181 decks +37% synergy
Ramunap Ruins
37% of 278 decks +37% synergy
Nykthos, Shrine to Nyx
36% of 1787 decks +30% synergy
Barbarian Ring
25% of 278 decks +24% synergy
Rogue's Passage
25% of 1787 decks +6% synergy
Restless Fortress
24% of 181 decks +23% synergy
Castle Locthwain
22% of 1787 decks +19% synergy
Kessig Wolf Run
21% of 19 decks +18% synergy
Witch's Cottage
20% of 1787 decks +18% synergy
Radiant Fountain
19% of 1787 decks +18% synergy
Ancient Tomb
19% of 1787 decks +8% synergy
Shizo, Death's Storehouse
16% of 1787 decks +14% synergy
Takenuma, Abandoned Mire
16% of 1787 decks +10% synergy
War Room
16% of 1787 decks +9% synergy
Boseiju, Who Endures
13% of 52 decks +4% synergy
Rivendell
13% of 54 decks +10% synergy
Otawara, Soaring City
11% of 54 decks +3% synergy
Kabira Crossroads
10% of 181 decks +10% synergy
Phyrexian Tower
10% of 1787 decks +6% synergy
The Black Gate
10% of 1787 decks +8% synergy
Shambling Vent
10% of 181 decks +10% synergy
Access Tunnel
10% of 1787 decks +8% synergy
Mystic Sanctuary
9% of 54 decks +3% synergy
Barren Moor
9% of 1787 decks +7% synergy
Mortuary Mire
8% of 1787 decks +6% synergy
Urza's Saga
8% of 1787 decks +1% synergy
Temple of the False God
8% of 1787 decks -2% synergy
Sapseep Forest
8% of 52 decks +7% synergy
Eiganjo, Seat of the Empire
7% of 181 decks +2% synergy
Command Beacon
7% of 1787 decks +2% synergy
Spymaster's Vault
6% of 337 decks +3% synergy
Ifnir Deadlands
6% of 1787 decks +6% synergy
Hissing Quagmire
6% of 52 decks +5% synergy
Yavimaya Hollow
6% of 52 decks +5% synergy
The Shire
6% of 52 decks +4% synergy
Gaea's Cradle
6% of 52 decks +3% synergy
Halimar Depths
6% of 54 decks +4% synergy
Boseiju, Who Shelters All
6% of 1787 decks +5% synergy
Minas Morgul, Dark Fortress
5% of 1787 decks +4% synergy
Mana Artifacts (35)
Sol Ring
94% of 1787 decks +9% synergy
Arcane Signet
74% of 1787 decks +3% synergy
Talisman of Indulgence
68% of 278 decks +62% synergy
Orzhov Signet
59% of 181 decks +52% synergy
Rakdos Signet
48% of 278 decks +41% synergy
Talisman of Hierarchy
44% of 181 decks +39% synergy
Dimir Signet
41% of 54 decks +33% synergy
Talisman of Dominance
37% of 54 decks +29% synergy
Mind Stone
31% of 1787 decks +13% synergy
Thought Vessel
24% of 1787 decks +8% synergy
Talisman of Creativity
24% of 21 decks +17% synergy
Throne of Eldraine
19% of 1787 decks +17% synergy
Pristine Talisman
18% of 1787 decks +17% synergy
Golgari Signet
15% of 52 decks +13% synergy
Mana Crypt
15% of 1787 decks +4% synergy
Fellwar Stone
15% of 1787 decks -6% synergy
Talisman of Conviction
15% of 20 decks +10% synergy
Relic of Sauron
14% of 21 decks +13% synergy
Azorius Signet
14% of 21 decks +8% synergy
Izzet Signet
14% of 21 decks +8% synergy
Jeweled Lotus
13% of 1787 decks +6% synergy
Charcoal Diamond
13% of 1787 decks +10% synergy
Nyx Lotus
12% of 1787 decks +11% synergy
Talisman of Resilience
12% of 52 decks +9% synergy
Caged Sun
11% of 1787 decks +8% synergy
Sceptre of Eternal Glory
9% of 1787 decks +8% synergy
Marble Diamond
9% of 181 decks +7% synergy
Commander's Sphere
8% of 1787 decks -8% synergy
Thran Dynamo
7% of 1787 decks +2% synergy
Lotus Petal
7% of 1787 decks +0% synergy
Staff of Compleation
6% of 1787 decks +5% synergy
Mana Vault
6% of 1787 decks -0% synergy
Everflowing Chalice
6% of 1787 decks +1% synergy
Sky Diamond
6% of 54 decks +3% synergy
Paradise Plume
5% of 1787 decks +5% synergy
Lands (50)
Blood Crypt
71% of 278 decks +61% synergy
Sulfurous Springs
68% of 278 decks +63% synergy
Dragonskull Summit
60% of 278 decks +54% synergy
Smoldering Marsh
59% of 278 decks +51% synergy
Overgrown Tomb
58% of 52 decks +48% synergy
Zagoth Triome
54% of 13 decks +50% synergy
Isolated Chapel
54% of 181 decks +48% synergy
Luxury Suite
53% of 278 decks +47% synergy
Godless Shrine
52% of 181 decks +42% synergy
Mount Doom
51% of 278 decks +50% synergy
Savai Triome
50% of 20 decks +47% synergy
Stomping Ground
47% of 19 decks +38% synergy
Vault of Champions
47% of 181 decks +41% synergy
Undergrowth Stadium
46% of 52 decks +41% synergy
Caves of Koilos
45% of 181 decks +38% synergy
Tainted Field
44% of 181 decks +41% synergy
Xander's Lounge
43% of 21 decks +39% synergy
Watery Grave
43% of 54 decks +32% synergy
Ziatora's Proving Ground
42% of 19 decks +39% synergy
Sunken Hollow
41% of 54 decks +32% synergy
Woodland Cemetery
40% of 52 decks +35% synergy
Orzhov Basilica
40% of 181 decks +36% synergy
Llanowar Wastes
38% of 52 decks +33% synergy
Raffine's Tower
38% of 21 decks +34% synergy
Indatha Triome
38% of 16 decks +34% synergy
Scoured Barrens
37% of 181 decks +35% synergy
Haunted Ridge
36% of 278 decks +33% synergy
Sacred Foundry
35% of 20 decks +27% synergy
Shattered Sanctum
34% of 181 decks +30% synergy
Foreboding Ruins
32% of 278 decks +29% synergy
Spire Garden
32% of 19 decks +26% synergy
Temple of Silence
31% of 181 decks +27% synergy
Fetid Heath
31% of 181 decks +28% synergy
Twilight Mire
31% of 52 decks +29% synergy
The World Tree
30% of 10 decks +28% synergy
Darkwater Catacombs
30% of 54 decks +26% synergy
Shipwreck Marsh
30% of 54 decks +25% synergy
Shineshadow Snarl
29% of 181 decks +27% synergy
Deathcap Glade
29% of 52 decks +26% synergy
Command Tower
28% of 1787 decks -45% synergy
Choked Estuary
28% of 54 decks +24% synergy
Underground River
28% of 54 decks +23% synergy
Drowned Catacomb
28% of 54 decks +22% synergy
Shadowy Backstreet
28% of 94 decks +24% synergy
Undercity Sewers
27% of 33 decks +24% synergy
Darkbore Pathway
27% of 52 decks +25% synergy
Taiga
26% of 19 decks +23% synergy
Rakdos Carnarium
26% of 278 decks +22% synergy
Myriad Landscape
25% of 1787 decks +5% synergy
Golgari Rot Farm
25% of 52 decks +21% synergy