Mortuary + Bolas's Citadel + Gray Merchant of Asphodel + Ashnod's Altar
Mortuary
Bolas's Citadel
Gray Merchant of Asphodel
Ashnod's Altar
Requires
Mortuary must be on the battlefield.
Bolas's Citadel must be on the battlefield.
Gray Merchant of Asphodel must be on the battlefield.
Ashnod's Altar must be on the battlefield.
You have 6 or more life.
Steps
- Sacrifice Gray Merchant of Asphodel to Ashnod's Altar, adding .
- Mortuary triggers, putting Gray Merchant of Asphodel on top of your library.
- Cast Gray Merchant of Asphodel, paying five life with Bolas's Citadel.
- Gray Merchant of Asphodel triggers, causing each opponent to lose at least 6 life and gaining you that much life.
- Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite lifegain. Infinite lifegain triggers. Infinite lifeloss. Infinite LTB. Infinite sacrifice triggers.
K'rrik, Son of Yawgmoth
0.25% of 14145 decks
35 decks
Ayara, First of Locthwain
0.51% of 4856 decks
25 decks
Yawgmoth, Thran Physician
0.23% of 5611 decks
13 decks
Elas il-Kor, Sadistic Pilgrim
0.15% of 6522 decks
10 decks
Marrow-Gnawer
0.07% of 9086 decks
6 decks
Braids, Arisen Nightmare
0.07% of 7008 decks
5 decks
Varragoth, Bloodsky Sire
0.35% of 1424 decks
5 decks
Sheoldred, the Apocalypse
0.04% of 9525 decks
4 decks
Acererak the Archlich
0.37% of 1094 decks
4 decks
Ashcoat of the Shadow Swarm
0.10% of 3126 decks
3 decks
Meren of Clan Nel Toth
0.02% of 15166 decks
3 decks
Gonti, Lord of Luxury
0.22% of 1353 decks
3 decks
Chainer, Dementia Master
0.18% of 1660 decks
3 decks
Massacre Girl
0.16% of 1831 decks
3 decks
Syr Konrad, the Grim
0.06% of 4648 decks
3 decks
Wilhelt, the Rotcleaver
0.02% of 19009 decks
3 decks
Nevinyrral, Urborg Tyrant
0.19% of 1542 decks
3 decks
Dina, Soul Steeper
0.04% of 7764 decks
3 decks
New Cards
Blasphemous Edict
50% of 6 decks
+16% synergy
Bloodthirsty Conqueror
50% of 10 decks
+38% synergy
Withering Torment
32% of 19 decks
+12% synergy
Enduring Tenacity
18% of 33 decks
+14% synergy
Valgavoth, Terror Eater
17% of 23 decks
+12% synergy
High Synergy Cards
Dark Ritual
75% of 217 decks
+52% synergy
Phyrexian Altar
55% of 217 decks
+51% synergy
Cabal Coffers
59% of 217 decks
+49% synergy
Sakura-Tribe Elder
63% of 19 decks
+45% synergy
Zulaport Cutthroat
54% of 217 decks
+44% synergy
Rooftop Storm
44% of 25 decks
+42% synergy
Aetherflux Reservoir
46% of 217 decks
+42% synergy
Urborg, Tomb of Yawgmoth
51% of 217 decks
+41% synergy
Viscera Seer
48% of 217 decks
+39% synergy
Blood Artist
50% of 217 decks
+38% synergy
Top Cards
Swords to Plowshares
60% of 30 decks
-3% synergy
Assassin's Trophy
58% of 19 decks
+28% synergy
Reanimate
50% of 217 decks
+34% synergy
Eternal Witness
47% of 19 decks
+27% synergy
Llanowar Elves
47% of 19 decks
+26% synergy
Kodama's Reach
47% of 19 decks
+16% synergy
Cultivate
47% of 19 decks
+1% synergy
Carrion Feeder
42% of 217 decks
+37% synergy
Moldervine Reclamation
42% of 19 decks
+33% synergy
Deathrite Shaman
42% of 19 decks
+30% synergy
Creatures
The Lord of Pain
100% of 3 decks
+83% synergy
Birds of Paradise
42% of 19 decks
+15% synergy
Crypt Ghast
40% of 217 decks
+35% synergy
Cruel Celebrant
40% of 30 decks
+32% synergy
Lotho, Corrupt Shirriff
38% of 16 decks
+23% synergy
Delighted Halfling
36% of 11 decks
+22% synergy
Pitiless Plunderer
35% of 217 decks
+27% synergy
Warren Soultrader
35% of 46 decks
+27% synergy
Dockside Extortionist
35% of 23 decks
+23% synergy
Gravecrawler
33% of 217 decks
+30% synergy
Esper Sentinel
32% of 28 decks
+12% synergy
Beledros Witherbloom
32% of 19 decks
+28% synergy
Haywire Mite
31% of 13 decks
+27% synergy
Mayhem Devil
30% of 23 decks
+20% synergy
Syr Konrad, the Grim
29% of 216 decks
+20% synergy
Mikaeus, the Unhallowed
29% of 217 decks
+26% synergy
Diregraf Captain
28% of 25 decks
+24% synergy
Ayara, First of Locthwain
28% of 216 decks
+24% synergy
Reassembling Skeleton
28% of 217 decks
+24% synergy
Dauthi Voidwalker
27% of 208 decks
+19% synergy
Children of Korlis
27% of 30 decks
+26% synergy
Valentin, Dean of the Vein
26% of 19 decks
+25% synergy
Poison-Tip Archer
26% of 19 decks
+21% synergy
Elves of Deep Shadow
26% of 19 decks
+15% synergy
Orcish Bowmasters
26% of 114 decks
+15% synergy
Elvish Mystic
26% of 19 decks
+9% synergy
Archivist of Oghma
26% of 27 decks
+20% synergy
Gala Greeters
25% of 16 decks
+22% synergy
Bartolomé del Presidio
25% of 12 decks
+18% synergy
K'rrik, Son of Yawgmoth
24% of 217 decks
+22% synergy
Bloodletter of Aclazotz
24% of 84 decks
+19% synergy
Solemn Simulacrum
24% of 217 decks
+10% synergy
Wayward Servant
23% of 30 decks
+23% synergy
Grand Abolisher
23% of 30 decks
+14% synergy
Dualcaster Mage
22% of 23 decks
+17% synergy
Marionette Apprentice
22% of 46 decks
+14% synergy
Chainer, Dementia Master
22% of 217 decks
+21% synergy
Sheoldred, the Apocalypse
21% of 178 decks
+16% synergy
Spore Frog
21% of 19 decks
+18% synergy
Mazirek, Kraul Death Priest
21% of 19 decks
+18% synergy
Reclamation Sage
21% of 19 decks
+10% synergy
Fyndhorn Elves
21% of 19 decks
+8% synergy
Wilhelt, the Rotcleaver
21% of 24 decks
+19% synergy
Ratadrabik of Urborg
21% of 24 decks
+18% synergy
Elas il-Kor, Sadistic Pilgrim
21% of 24 decks
+9% synergy
Vito, Thorn of the Dusk Rose
21% of 213 decks
+15% synergy
Vilis, Broker of Blood
20% of 217 decks
+17% synergy
Havengul Lich
20% of 25 decks
+18% synergy
Luminous Broodmoth
20% of 30 decks
+18% synergy
Soul Warden
20% of 30 decks
+15% synergy
Instants
Vampiric Tutor
50% of 217 decks
+32% synergy
Putrefy
42% of 19 decks
+26% synergy
Beast Within
42% of 19 decks
+4% synergy
Enlightened Tutor
40% of 30 decks
+22% synergy
Counterspell
40% of 25 decks
-3% synergy
Path to Exile
37% of 30 decks
-9% synergy
Dovin's Veto
36% of 11 decks
+17% synergy
Cyclonic Rift
36% of 25 decks
+8% synergy
Mana Drain
32% of 25 decks
+17% synergy
Worldly Tutor
32% of 19 decks
+17% synergy
Fracture
31% of 29 decks
+24% synergy
Rakdos Charm
30% of 23 decks
+16% synergy
Chaos Warp
30% of 23 decks
-2% synergy
Entomb
29% of 217 decks
+22% synergy
Culling the Weak
29% of 217 decks
+25% synergy
An Offer You Can't Refuse
29% of 21 decks
+8% synergy
Mystical Tutor
28% of 25 decks
+13% synergy
Fierce Guardianship
28% of 25 decks
+10% synergy
Deadly Rollick
27% of 213 decks
+16% synergy
Cabal Ritual
27% of 217 decks
+22% synergy
Teferi's Protection
27% of 30 decks
+7% synergy
Crop Rotation
26% of 19 decks
+16% synergy
Abrupt Decay
26% of 19 decks
+16% synergy
Village Rites
24% of 213 decks
+15% synergy
Force of Will
24% of 25 decks
+13% synergy
Brainstorm
24% of 25 decks
+3% synergy
Pyroblast
22% of 23 decks
+16% synergy
Deflecting Swat
22% of 23 decks
+5% synergy
Terminate
22% of 23 decks
+1% synergy
Tend the Pests
21% of 19 decks
+20% synergy
Mortality Spear
21% of 19 decks
+18% synergy
Deadly Dispute
20% of 201 decks
+9% synergy
Rebuff the Wicked
20% of 30 decks
+18% synergy
Pact of Negation
20% of 25 decks
+13% synergy
Force of Negation
20% of 25 decks
+11% synergy
Despark
20% of 30 decks
+4% synergy
Negate
20% of 25 decks
-3% synergy
Anguished Unmaking
20% of 30 decks
-4% synergy
Defile
18% of 217 decks
+15% synergy
Imp's Mischief
18% of 217 decks
+15% synergy
Malakir Rebirth
18% of 213 decks
+10% synergy
Burnt Offering
17% of 23 decks
+15% synergy
Red Elemental Blast
17% of 23 decks
+11% synergy
Mortify
17% of 30 decks
+5% synergy
Infernal Grasp
17% of 199 decks
+9% synergy
Arcane Denial
16% of 25 decks
-4% synergy
Nature's Claim
16% of 19 decks
+6% synergy
Fell the Profane
15% of 46 decks
+4% synergy
Not Dead After All
14% of 92 decks
+10% synergy
Tragic Slip
14% of 217 decks
+10% synergy
Sorceries
Demonic Tutor
52% of 217 decks
+29% synergy
Feed the Swarm
39% of 213 decks
+21% synergy
Rise of the Witch-king
36% of 11 decks
+30% synergy
Toxic Deluge
35% of 217 decks
+18% synergy
Culling Ritual
32% of 19 decks
+20% synergy
Diabolic Tutor
31% of 217 decks
+25% synergy
Faithless Looting
30% of 23 decks
+14% synergy
Buried Alive
29% of 217 decks
+24% synergy
Diabolic Intent
29% of 217 decks
+21% synergy
Sign in Blood
29% of 217 decks
+19% synergy
Victimize
29% of 217 decks
+17% synergy
Damn
29% of 28 decks
+12% synergy
Supreme Verdict
27% of 11 decks
+13% synergy
Bala Ged Recovery
26% of 19 decks
+17% synergy
Damnation
25% of 217 decks
+17% synergy
Exsanguinate
24% of 217 decks
+19% synergy
Grim Tutor
24% of 217 decks
+19% synergy
Blasphemous Act
22% of 23 decks
-12% synergy
Farseek
21% of 19 decks
-13% synergy
Rampant Growth
21% of 19 decks
-14% synergy
Peer into the Abyss
19% of 213 decks
+16% synergy
Wheel of Fortune
17% of 23 decks
+12% synergy
Vandalblast
17% of 23 decks
+1% synergy
Jeska's Will
17% of 23 decks
-0% synergy
Bubbling Muck
17% of 217 decks
+15% synergy
Night's Whisper
16% of 217 decks
+7% synergy
Ponder
16% of 25 decks
+3% synergy
Pest Infestation
16% of 19 decks
+14% synergy
Nature's Lore
16% of 19 decks
-16% synergy
Rite of Oblivion
14% of 28 decks
+11% synergy
Torment of Hailfire
14% of 217 decks
+9% synergy
Insatiable Avarice
14% of 57 decks
+9% synergy
Profane Tutor
14% of 208 decks
+11% synergy
Plague of Vermin
13% of 217 decks
+13% synergy
Mutilate
13% of 217 decks
+11% synergy
Vindicate
13% of 30 decks
+7% synergy
Imperial Seal
13% of 217 decks
+7% synergy
Read the Bones
13% of 217 decks
+5% synergy
Rite of Replication
12% of 25 decks
+9% synergy
Gitaxian Probe
12% of 25 decks
+6% synergy
Preordain
12% of 25 decks
+1% synergy
Windfall
12% of 25 decks
-1% synergy
Final Parting
12% of 217 decks
+10% synergy
Living Death
12% of 217 decks
+7% synergy
Farewell
11% of 27 decks
-2% synergy
Dread Return
11% of 217 decks
+5% synergy
Revival // Revenge
10% of 30 decks
+9% synergy
Kaya's Wrath
10% of 30 decks
+7% synergy
Fumigate
10% of 30 decks
+7% synergy
Wrath of God
10% of 30 decks
+3% synergy
Utility Artifacts
Jet Medallion
40% of 217 decks
+37% synergy
Skullclamp
35% of 217 decks
+23% synergy
Sensei's Divining Top
35% of 217 decks
+29% synergy
Bontu's Monument
34% of 217 decks
+32% synergy
Lightning Greaves
29% of 217 decks
+4% synergy
Altar of Dementia
24% of 217 decks
+21% synergy
Swiftfoot Boots
16% of 217 decks
-12% synergy
Nim Deathmantle
15% of 217 decks
+15% synergy
The One Ring
15% of 124 decks
+6% synergy
Expedition Map
11% of 217 decks
+7% synergy
Whip of Erebos
10% of 217 decks
+7% synergy
Wishclaw Talisman
10% of 216 decks
+4% synergy
Thornbite Staff
6% of 217 decks
+6% synergy
Wayfarer's Bauble
6% of 217 decks
-4% synergy
Mindcrank
6% of 217 decks
+4% synergy
Panharmonicon
6% of 217 decks
+2% synergy
Helm of Awakening
6% of 217 decks
+5% synergy
Desecrated Tomb
5% of 217 decks
+5% synergy
Alhammarret's Archive
5% of 217 decks
+3% synergy
Enchantments
Smothering Tithe
37% of 30 decks
+12% synergy
Necropotence
34% of 217 decks
+28% synergy
Rhystic Study
32% of 25 decks
+4% synergy
Trudge Garden
32% of 19 decks
+31% synergy
Animate Dead
31% of 217 decks
+22% synergy
Phyrexian Arena
31% of 217 decks
+16% synergy
Goblin Bombardment
30% of 23 decks
+24% synergy
Exquisite Blood
30% of 217 decks
+25% synergy
Sanguine Bond
29% of 217 decks
+23% synergy
Bastion of Remembrance
25% of 213 decks
+19% synergy
Solemnity
23% of 30 decks
+22% synergy
Grave Pact
22% of 217 decks
+18% synergy
Underworld Breach
22% of 23 decks
+16% synergy
Black Market
22% of 217 decks
+17% synergy
Necroduality
21% of 24 decks
+20% synergy
Dictate of Erebos
21% of 217 decks
+17% synergy
Phyrexian Reclamation
20% of 217 decks
+17% synergy
Mystic Remora
20% of 25 decks
+2% synergy
The Meathook Massacre
20% of 199 decks
+15% synergy
Black Market Connections
18% of 182 decks
+7% synergy
Bitterblossom
15% of 217 decks
+11% synergy
Necromancy
14% of 217 decks
+11% synergy
Authority of the Consuls
13% of 30 decks
+9% synergy
Land Tax
13% of 30 decks
+7% synergy
Blind Obedience
13% of 30 decks
+7% synergy
Carnival of Souls
12% of 217 decks
+12% synergy
Dance of the Dead
11% of 217 decks
+9% synergy
Phyrexian Unlife
10% of 30 decks
+10% synergy
Greed
10% of 217 decks
+7% synergy
Nowhere to Run
9% of 33 decks
+8% synergy
Font of Agonies
9% of 217 decks
+8% synergy
Dreadhorde Invasion
8% of 217 decks
+6% synergy
Contamination
8% of 217 decks
+7% synergy
Ripples of Undeath
8% of 40 decks
+1% synergy
Dark Prophecy
7% of 217 decks
+6% synergy
Tortured Existence
7% of 217 decks
+6% synergy
Bloodchief Ascension
7% of 217 decks
+4% synergy
Leshrac's Sigil
7% of 217 decks
+7% synergy
Heartless Summoning
7% of 217 decks
+6% synergy
Vampiric Rites
7% of 217 decks
+4% synergy
Blight Mound
6% of 209 decks
+5% synergy
Case of the Stashed Skeleton
6% of 66 decks
+5% synergy
Chthonian Nightmare
6% of 50 decks
+3% synergy
Attrition
6% of 217 decks
+5% synergy
Underworld Dreams
6% of 217 decks
+4% synergy
Kaya's Ghostform
6% of 217 decks
+2% synergy
Oubliette
6% of 217 decks
+5% synergy
Revel in Riches
6% of 217 decks
+2% synergy
Planeswalkers
Grist, the Hunger Tide
26% of 19 decks
+23% synergy
Liliana, Dreadhorde General
15% of 217 decks
+11% synergy
Professor Onyx
9% of 209 decks
+7% synergy
Liliana of the Dark Realms
8% of 217 decks
+7% synergy
Tevesh Szat, Doom of Fools
7% of 211 decks
+5% synergy
Lolth, Spider Queen
5% of 201 decks
+4% synergy
Liliana, Untouched by Death
5% of 217 decks
+5% synergy
Utility Lands
Bojuka Bog
47% of 217 decks
+17% synergy
Phyrexian Tower
44% of 217 decks
+35% synergy
Cabal Stronghold
38% of 217 decks
+34% synergy
Reliquary Tower
30% of 217 decks
+1% synergy
Nykthos, Shrine to Nyx
30% of 217 decks
+24% synergy
Witch's Cottage
23% of 216 decks
+19% synergy
Boseiju, Who Endures
22% of 18 decks
+3% synergy
Ancient Tomb
21% of 217 decks
+11% synergy
Takenuma, Abandoned Mire
20% of 192 decks
+10% synergy
Castle Locthwain
19% of 216 decks
+14% synergy
Three Tree City
16% of 31 decks
+6% synergy
Grim Backwoods
16% of 19 decks
+12% synergy
Castle Garenbrig
16% of 19 decks
+11% synergy
Eiganjo, Seat of the Empire
15% of 27 decks
+6% synergy
Mortuary Mire
14% of 217 decks
+9% synergy
High Market
14% of 217 decks
+11% synergy
Otawara, Soaring City
14% of 22 decks
-3% synergy
Crypt of Agadeem
12% of 217 decks
+11% synergy
Mudflat Village
12% of 33 decks
+9% synergy
Urza's Saga
11% of 208 decks
+4% synergy
War Room
11% of 211 decks
+4% synergy
Emergence Zone
11% of 217 decks
+8% synergy
Thespian's Stage
11% of 217 decks
+8% synergy
Barren Moor
11% of 217 decks
+7% synergy
Shambling Vent
10% of 30 decks
+8% synergy
Lake of the Dead
10% of 217 decks
+9% synergy
Buried Ruin
10% of 217 decks
+5% synergy
Volrath's Stronghold
9% of 217 decks
+8% synergy
Command Beacon
9% of 217 decks
+5% synergy
Rogue's Passage
9% of 217 decks
-11% synergy
Westvale Abbey
8% of 217 decks
+6% synergy
Shizo, Death's Storehouse
8% of 217 decks
+3% synergy
Strip Mine
7% of 217 decks
+4% synergy
Spymaster's Vault
7% of 46 decks
+3% synergy
Geier Reach Sanitarium
6% of 217 decks
+3% synergy
Temple of the False God
6% of 217 decks
-4% synergy
Crystal Vein
6% of 217 decks
+5% synergy
Swarmyard
5% of 217 decks
+4% synergy
Mana Artifacts
Sol Ring
92% of 217 decks
+7% synergy
Arcane Signet
60% of 216 decks
-12% synergy
Talisman of Hierarchy
53% of 30 decks
+29% synergy
Dimir Signet
48% of 25 decks
+18% synergy
Orzhov Signet
43% of 30 decks
+16% synergy
Rakdos Signet
39% of 23 decks
+10% synergy
Azorius Signet
36% of 11 decks
+10% synergy
Talisman of Dominance
36% of 25 decks
+5% synergy
Talisman of Indulgence
30% of 23 decks
+4% synergy
Talisman of Progress
27% of 11 decks
+4% synergy
Thought Vessel
19% of 217 decks
+2% synergy
Mind Stone
19% of 217 decks
+2% synergy
Mana Vault
18% of 217 decks
+12% synergy
Lotus Petal
18% of 217 decks
+11% synergy
Fellwar Stone
18% of 217 decks
-3% synergy
Mana Crypt
17% of 217 decks
+9% synergy
Jeweled Lotus
16% of 211 decks
+10% synergy
Talisman of Resilience
16% of 19 decks
+4% synergy
Chrome Mox
16% of 217 decks
+9% synergy
Throne of Eldraine
12% of 88 decks
+10% synergy
Nyx Lotus
11% of 213 decks
+9% synergy
Commander's Sphere
8% of 217 decks
-7% synergy
Sceptre of Eternal Glory
7% of 162 decks
+6% synergy
Mox Amber
7% of 217 decks
+3% synergy
Mox Opal
7% of 217 decks
+3% synergy
Thran Dynamo
6% of 217 decks
+2% synergy
Charcoal Diamond
6% of 217 decks
+1% synergy
Gilded Lotus
6% of 217 decks
+3% synergy
Caged Sun
6% of 217 decks
+3% synergy
Mox Diamond
6% of 217 decks
+1% synergy
Lands
Stomping Ground
75% of 4 decks
+34% synergy
Overgrown Tomb
63% of 19 decks
+21% synergy
Plateau
57% of 7 decks
+45% synergy
Crumbling Necropolis
57% of 7 decks
+26% synergy
Sacred Foundry
57% of 7 decks
+21% synergy
Godless Shrine
53% of 30 decks
+13% synergy
Woodland Cemetery
53% of 19 decks
+25% synergy
Xander's Lounge
50% of 6 decks
+23% synergy
Sunken Hollow
48% of 25 decks
+13% synergy
Blood Crypt
48% of 23 decks
+9% synergy
Tainted Wood
47% of 19 decks
+34% synergy
Hallowed Fountain
45% of 11 decks
+5% synergy
Raffine's Tower
44% of 9 decks
+17% synergy
Smoldering Marsh
43% of 23 decks
+11% synergy
Llanowar Wastes
42% of 19 decks
+16% synergy
Darkwater Catacombs
40% of 25 decks
+25% synergy
Isolated Chapel
40% of 30 decks
+12% synergy
Caves of Koilos
40% of 30 decks
+12% synergy
Temple of Malady
37% of 19 decks
+21% synergy
Arcane Sanctum
36% of 11 decks
+9% synergy
Watery Grave
36% of 25 decks
-5% synergy
Badlands
35% of 23 decks
+21% synergy
Luxury Suite
35% of 23 decks
+8% synergy
Underground River
32% of 25 decks
+12% synergy
Deathcap Glade
32% of 19 decks
+18% synergy
Undergrowth Stadium
32% of 19 decks
+5% synergy
Command Tower
30% of 217 decks
-44% synergy
Drowned Catacomb
28% of 25 decks
+2% synergy
Skycloud Expanse
27% of 11 decks
+15% synergy
Sea of Clouds
27% of 11 decks
+1% synergy
Scoured Barrens
27% of 30 decks
+18% synergy
Orzhov Basilica
27% of 30 decks
+11% synergy
Tainted Peak
26% of 23 decks
+16% synergy
Vault of Champions
24% of 29 decks
-2% synergy
Tainted Isle
24% of 25 decks
+13% synergy
Morphic Pool
24% of 25 decks
-2% synergy
Brightclimb Pathway
23% of 30 decks
+13% synergy
Scrubland
23% of 30 decks
+10% synergy
Bloodfell Caves
22% of 23 decks
+15% synergy
Foreboding Ruins
22% of 23 decks
+6% synergy
Dragonskull Summit
22% of 23 decks
-9% synergy
Darkbore Pathway
21% of 19 decks
+12% synergy
Jungle Hollow
21% of 19 decks
+12% synergy
Twilight Mire
21% of 19 decks
+11% synergy
Necroblossom Snarl
21% of 19 decks
+9% synergy
Fetid Heath
20% of 30 decks
+9% synergy
Tainted Field
20% of 30 decks
+7% synergy
Underground Sea
20% of 25 decks
+6% synergy
Choked Estuary
20% of 25 decks
+3% synergy
Temple of Silence
20% of 30 decks
+2% synergy