Repercussion + Brash Taunter + Gideon's Sacrifice
Repercussion
Brash Taunter
Gideon's Sacrifice
Requires
Repercussion must be on the battlefield.
Brash Taunter must be on the battlefield.
Gideon's Sacrifice must be in hand.
Mana needed:
Steps
- Have Brash Taunter dealt damage, cast Gideon's Sacrifice in response targeting Brash Taunter.
- Repercussion triggers, dealing damage to Brash Taunter.
- Brash Taunter deals damage to target opponent.
- Repeat.
Results
Infinite damage.
Top Commanders
Piru, the Volatile
6.48% of 1621 decks
105 decks
Nelly Borca, Impulsive Accuser
1.89% of 4243 decks
80 decks
Queen Marchesa
0.42% of 13476 decks
56 decks
Jared Carthalion, True Heir
2.03% of 2563 decks
52 decks
Wayta, Trainer Prodigy
1.15% of 4156 decks
48 decks
Firesong and Sunspeaker
1.06% of 3862 decks
41 decks
Taii Wakeen, Perfect Shot
0.78% of 3447 decks
27 decks
Gisela, Blade of Goldnight
1.05% of 2579 decks
27 decks
Archangel Avacyn
2.27% of 1147 decks
26 decks
Ruhan of the Fomori
0.80% of 2373 decks
19 decks
Sevinne, the Chronoclasm
1.08% of 923 decks
10 decks
Baeloth Barrityl, Entertainer // Noble Heritage
0.41% of 2220 decks
9 decks
The Second Doctor // Donna Noble
5.63% of 142 decks
8 decks
Rem Karolus, Stalwart Slayer
1.03% of 682 decks
7 decks
Aurelia, the Law Above
0.25% of 2372 decks
6 decks
Ghen, Arcanum Weaver
0.26% of 2318 decks
6 decks
Kellan, the Fae-Blooded
0.20% of 2941 decks
6 decks
Akiri, Fearless Voyager
0.44% of 1366 decks
6 decks
New Cards
New Way Forward
25% of 12 decks
+25% synergy
Mistrise Village
8% of 12 decks
+6% synergy
Sunbillow Verge
8% of 207 decks
+3% synergy
Bleachbone Verge
4% of 67 decks
-2% synergy
Riverpyre Verge
4% of 27 decks
-2% synergy
High Synergy Cards
Boros Reckoner
76% of 678 decks
+75% synergy
Stuffy Doll
64% of 678 decks
+63% synergy
Pariah
61% of 678 decks
+60% synergy
Barbed Servitor
58% of 194 decks
+58% synergy
Arcbond
54% of 678 decks
+53% synergy
Chain Reaction
57% of 678 decks
+52% synergy
Blasphemous Act
85% of 678 decks
+52% synergy
Star of Extinction
52% of 678 decks
+51% synergy
Phyrexian Vindicator
51% of 678 decks
+50% synergy
Deflecting Palm
55% of 678 decks
+50% synergy
Top Cards
Boros Charm
56% of 678 decks
+32% synergy
Nature's Lore
51% of 133 decks
+19% synergy
Farseek
48% of 133 decks
+14% synergy
Heroic Intervention
47% of 133 decks
+18% synergy
Cultivate
47% of 133 decks
+2% synergy
Swords to Plowshares
46% of 678 decks
-17% synergy
Spitemare
45% of 678 decks
+45% synergy
Three Visits
44% of 133 decks
+19% synergy
Mogg Maniac
43% of 678 decks
+43% synergy
Blazing Sunsteel
43% of 678 decks
+42% synergy
Game Changers
Rhystic Study
43% of 95 decks
+16% synergy
Smothering Tithe
32% of 678 decks
+8% synergy
Trouble in Pairs
25% of 561 decks
+20% synergy
Demonic Tutor
22% of 227 decks
+0% synergy
Enlightened Tutor
21% of 678 decks
+4% synergy
Vampiric Tutor
16% of 227 decks
-1% synergy
Jeska's Will
16% of 678 decks
-1% synergy
Bolas's Citadel
11% of 227 decks
+2% synergy
Ancient Tomb
9% of 678 decks
-2% synergy
The One Ring
6% of 678 decks
-2% synergy
Creatures
Illusory Ambusher
40% of 95 decks
+40% synergy
Ill-Tempered Loner
38% of 678 decks
+37% synergy
Hornet Nest
37% of 133 decks
+36% synergy
Truefire Captain
34% of 678 decks
+34% synergy
Toralf, God of Fury
34% of 678 decks
+33% synergy
Ripjaw Raptor
34% of 133 decks
+32% synergy
Gisela, Blade of Goldnight
33% of 678 decks
+27% synergy
Screaming Nemesis
32% of 431 decks
+32% synergy
Swans of Bryn Argoll
29% of 95 decks
+29% synergy
Ranging Raptors
29% of 133 decks
+28% synergy
Vito, Thorn of the Dusk Rose
27% of 227 decks
+21% synergy
Donna Noble
26% of 630 decks
+26% synergy
Spiteful Sliver
26% of 678 decks
+25% synergy
Ulvenwald Tracker
26% of 133 decks
+24% synergy
Body of Knowledge
25% of 95 decks
+24% synergy
Phyrexian Metamorph
24% of 95 decks
+17% synergy
Solemn Simulacrum
24% of 678 decks
+10% synergy
Selfless Squire
24% of 678 decks
+22% synergy
Solphim, Mayhem Dominus
23% of 678 decks
+20% synergy
Birds of Paradise
23% of 133 decks
-4% synergy
Aura Thief
23% of 95 decks
+23% synergy
Wayta, Trainer Prodigy
23% of 111 decks
+21% synergy
Vizkopa Guildmage
22% of 227 decks
+20% synergy
Ignoble Hierarch
22% of 18 decks
-3% synergy
Soulfire Grand Master
22% of 95 decks
+21% synergy
Sakura-Tribe Elder
22% of 133 decks
+4% synergy
Loran of the Third Path
21% of 678 decks
+15% synergy
Neyith of the Dire Hunt
20% of 133 decks
+18% synergy
Coalhauler Swine
19% of 678 decks
+19% synergy
Esper Sentinel
19% of 678 decks
-0% synergy
Thought Sponge
19% of 95 decks
+19% synergy
Regal Behemoth
19% of 133 decks
+17% synergy
Athreos, Shroud-Veiled
18% of 227 decks
+16% synergy
Lotho, Corrupt Shirriff
18% of 216 decks
+6% synergy
Tamanoa
18% of 133 decks
+18% synergy
Dawnglade Regent
18% of 133 decks
+17% synergy
Mangara, the Diplomat
18% of 678 decks
+14% synergy
Volcano Hellion
17% of 678 decks
+17% synergy
Cacophodon
17% of 133 decks
+17% synergy
Grothama, All-Devouring
17% of 133 decks
+17% synergy
Nin, the Pain Artist
17% of 95 decks
+16% synergy
Kardur, Doomscourge
17% of 227 decks
+10% synergy
Rivaz of the Claw
15% of 227 decks
+13% synergy
Wrathful Red Dragon
15% of 678 decks
+14% synergy
Windborn Muse
15% of 678 decks
+12% synergy
Sun Titan
15% of 678 decks
+5% synergy
Mischievous Quanar
15% of 95 decks
+15% synergy
Breena, the Demagogue
15% of 227 decks
+11% synergy
Heartflame Duelist
14% of 631 decks
+14% synergy
Baleful Strix
14% of 21 decks
+1% synergy
Instants
Reins of Power
40% of 95 decks
+39% synergy
Path to Exile
37% of 678 decks
-10% synergy
Anguished Unmaking
34% of 227 decks
+10% synergy
Comeuppance
33% of 678 decks
+32% synergy
Inkshield
32% of 227 decks
+26% synergy
Stinging Study
31% of 227 decks
+30% synergy
Rakdos Charm
31% of 227 decks
+16% synergy
Refuse // Cooperate
31% of 95 decks
+30% synergy
Generous Gift
30% of 678 decks
+5% synergy
Beast Within
28% of 133 decks
-9% synergy
Desertion
26% of 95 decks
+26% synergy
Take the Bait
26% of 561 decks
+23% synergy
Malakir Rebirth
26% of 227 decks
+18% synergy
Flawless Maneuver
25% of 678 decks
+15% synergy
Fire Covenant
24% of 227 decks
+21% synergy
Leadership Vacuum
24% of 95 decks
+24% synergy
Chaos Warp
23% of 678 decks
-8% synergy
Gather Specimens
22% of 95 decks
+22% synergy
Martyrdom
20% of 678 decks
+20% synergy
Delirium
20% of 227 decks
+19% synergy
Teferi's Protection
20% of 678 decks
+0% synergy
Thrilling Encore
19% of 227 decks
+18% synergy
Khalni Ambush
18% of 133 decks
+16% synergy
Eladamri's Call
17% of 133 decks
+7% synergy
Arcane Denial
17% of 95 decks
-3% synergy
Tamiyo's Safekeeping
17% of 133 decks
+10% synergy
Despark
16% of 227 decks
+1% synergy
Counterspell
16% of 95 decks
-27% synergy
Invert Polarity
16% of 64 decks
+12% synergy
Batwing Brume
15% of 227 decks
+14% synergy
Deflecting Swat
14% of 678 decks
-2% synergy
Klauth's Will
14% of 133 decks
+12% synergy
Growth Spiral
14% of 21 decks
-8% synergy
Legion Leadership
14% of 469 decks
+8% synergy
Valakut Awakening
13% of 678 decks
+7% synergy
Dawn's Truce
13% of 418 decks
+5% synergy
Wear // Tear
13% of 678 decks
+5% synergy
Worldly Tutor
13% of 133 decks
-1% synergy
Backlash
13% of 227 decks
+12% synergy
Cerebral Vortex
13% of 95 decks
+12% synergy
Blue Sun's Zenith
13% of 95 decks
+10% synergy
Crackling Doom
12% of 227 decks
+5% synergy
Dark Ritual
12% of 227 decks
-10% synergy
Starstorm
12% of 678 decks
+11% synergy
Not Dead After All
12% of 207 decks
+9% synergy
Stroke of Midnight
12% of 634 decks
+2% synergy
Mystical Tutor
12% of 95 decks
-3% synergy
Fierce Guardianship
12% of 95 decks
-7% synergy
Cyclonic Rift
12% of 95 decks
-15% synergy
Lightning Bolt
12% of 678 decks
+1% synergy
Sorceries
Rampant Growth
38% of 133 decks
+4% synergy
Painful Truths
29% of 227 decks
+26% synergy
Kodama's Reach
28% of 133 decks
-3% synergy
Ruinous Ultimatum
25% of 227 decks
+6% synergy
Disrupt Decorum
21% of 678 decks
+18% synergy
Rishkar's Expertise
18% of 133 decks
+8% synergy
Earthquake
17% of 678 decks
+15% synergy
Day's Undoing
17% of 95 decks
+16% synergy
Night's Whisper
17% of 227 decks
+8% synergy
Rolling Earthquake
16% of 678 decks
+16% synergy
Solar Blaze
16% of 678 decks
+15% synergy
Deafening Clarion
16% of 678 decks
+15% synergy
Taunt from the Rampart
16% of 654 decks
+12% synergy
Read the Bones
15% of 227 decks
+8% synergy
Reanimate
15% of 227 decks
-1% synergy
Bala Ged Recovery
15% of 133 decks
+7% synergy
Sign in Blood
15% of 227 decks
+6% synergy
Spectacular Showdown
14% of 678 decks
+13% synergy
Harmonize
14% of 133 decks
+6% synergy
Promise of Loyalty
14% of 678 decks
+12% synergy
Bushwhack
14% of 133 decks
+11% synergy
Vandalblast
13% of 678 decks
-2% synergy
Skyshroud Claim
13% of 133 decks
+4% synergy
Mana Geyser
12% of 678 decks
+6% synergy
Sevinne's Reclamation
12% of 678 decks
+5% synergy
Wheel of Misfortune
12% of 678 decks
+9% synergy
Faithless Looting
12% of 678 decks
-5% synergy
Prisoner's Dilemma
11% of 561 decks
+10% synergy
Bridgeworks Battle
11% of 94 decks
+7% synergy
Idyllic Tutor
11% of 678 decks
+6% synergy
Chandra's Ignition
11% of 678 decks
+6% synergy
Damn
11% of 227 decks
-6% synergy
Open the Armory
10% of 678 decks
+5% synergy
Deep Analysis
9% of 95 decks
+7% synergy
Solve the Equation
9% of 95 decks
+5% synergy
Imposing Grandeur
9% of 678 decks
+9% synergy
Mythos of Snapdax
9% of 227 decks
+6% synergy
Acidic Soil
9% of 678 decks
+8% synergy
Rip Apart
9% of 678 decks
+5% synergy
Windfall
8% of 95 decks
-4% synergy
Shatterskull Smashing
8% of 678 decks
+5% synergy
Fiery Confluence
8% of 678 decks
+5% synergy
Gamble
8% of 678 decks
-2% synergy
Savage Twister
8% of 133 decks
+7% synergy
Insurrection
7% of 678 decks
+6% synergy
Scheming Symmetry
7% of 227 decks
+5% synergy
Secret Rendezvous
7% of 678 decks
+5% synergy
Cut a Deal
7% of 678 decks
+4% synergy
Insatiable Avarice
7% of 174 decks
+4% synergy
Farewell
7% of 678 decks
-6% synergy
Utility Artifacts
Pariah's Shield
39% of 678 decks
+38% synergy
Fiendlash
27% of 678 decks
+26% synergy
Sunforger
25% of 678 decks
+20% synergy
Swiftfoot Boots
23% of 678 decks
-4% synergy
Mind Stone
23% of 678 decks
+6% synergy
Mithril Coat
19% of 654 decks
+15% synergy
Darksteel Plate
19% of 678 decks
+18% synergy
Rod of Absorption
19% of 95 decks
+19% synergy
Lightning Greaves
15% of 678 decks
-10% synergy
Wayfarer's Bauble
14% of 678 decks
+4% synergy
Commander's Sphere
14% of 678 decks
-1% synergy
Bloodthirsty Blade
12% of 678 decks
+11% synergy
Netherborn Altar
11% of 227 decks
+11% synergy
Basilisk Collar
11% of 678 decks
+7% synergy
Aetherflux Reservoir
10% of 678 decks
+6% synergy
Wedding Ring
8% of 678 decks
+6% synergy
Shadowspear
8% of 678 decks
+4% synergy
Boxing Ring
8% of 133 decks
+7% synergy
Hammer of Nazahn
7% of 678 decks
+5% synergy
Archaeomancer's Map
6% of 678 decks
+3% synergy
Azorius Locket
6% of 95 decks
+5% synergy
Tome of Legends
6% of 678 decks
+6% synergy
Whip of Erebos
6% of 227 decks
+2% synergy
General's Regalia
5% of 678 decks
+5% synergy
Ruby Medallion
5% of 678 decks
+3% synergy
Enchantments
Guilty Conscience
38% of 678 decks
+38% synergy
Phyrexian Arena
25% of 227 decks
+10% synergy
Ghostly Prison
23% of 678 decks
+12% synergy
Sanguine Bond
22% of 227 decks
+17% synergy
Public Enemy
22% of 95 decks
+22% synergy
Mystic Remora
22% of 95 decks
+5% synergy
Court of Bounty
22% of 133 decks
+21% synergy
Black Market Connections
22% of 227 decks
+11% synergy
Saving Grace
19% of 678 decks
+19% synergy
Whirlwind of Thought
19% of 95 decks
+9% synergy
Fiery Emancipation
19% of 678 decks
+15% synergy
Smuggler's Share
18% of 678 decks
+16% synergy
Copy Enchantment
18% of 95 decks
+17% synergy
Curse of Opulence
17% of 678 decks
+14% synergy
Land Tax
17% of 678 decks
+10% synergy
Dictate of the Twin Gods
16% of 678 decks
+15% synergy
Confounding Conundrum
16% of 95 decks
+15% synergy
Redemption Arc
16% of 561 decks
+15% synergy
Pyrohemia
15% of 678 decks
+14% synergy
Hot Pursuit
15% of 561 decks
+14% synergy
Duelist's Heritage
14% of 678 decks
+12% synergy
Sylvan Library
14% of 133 decks
+3% synergy
Court of Garenbrig
14% of 121 decks
+12% synergy
Rite of Passage
14% of 133 decks
+13% synergy
Pestilence
13% of 227 decks
+12% synergy
Shiny Impetus
13% of 678 decks
+10% synergy
City on Fire
12% of 678 decks
+7% synergy
Shielded by Faith
11% of 678 decks
+10% synergy
Descent into Avernus
11% of 678 decks
+8% synergy
Rakdos Joins Up
11% of 174 decks
+8% synergy
Lightmine Field
11% of 678 decks
+10% synergy
Shield of the Oversoul
11% of 133 decks
+8% synergy
Kaya's Ghostform
10% of 227 decks
+6% synergy
Furnace of Rath
10% of 678 decks
+9% synergy
Mayael's Aria
10% of 133 decks
+7% synergy
Lure
9% of 133 decks
+8% synergy
Animate Dead
9% of 227 decks
-0% synergy
Defense of the Heart
8% of 133 decks
+6% synergy
Gift of Immortality
8% of 678 decks
+6% synergy
Blind Obedience
8% of 678 decks
+1% synergy
Spiteful Banditry
8% of 654 decks
+6% synergy
The Sound of Drums
8% of 607 decks
+7% synergy
Powerstone Minefield
8% of 678 decks
+8% synergy
Greed
8% of 227 decks
+6% synergy
Rite of the Raging Storm
8% of 678 decks
+7% synergy
Utopia Sprawl
8% of 133 decks
-0% synergy
Mirrormade
7% of 95 decks
+5% synergy
Court of Ire
7% of 678 decks
+6% synergy
Annie Joins Up
7% of 99 decks
-5% synergy
Court of Grace
7% of 678 decks
+4% synergy
Planeswalkers
Domri, Anarch of Bolas
8% of 133 decks
+4% synergy
The Wanderer
6% of 678 decks
+5% synergy
Kaya the Inexorable
5% of 227 decks
+4% synergy
Utility Lands
Bojuka Bog
28% of 227 decks
-2% synergy
Reliquary Tower
25% of 678 decks
-4% synergy
Rogue's Passage
23% of 678 decks
+3% synergy
Vault of the Archangel
16% of 227 decks
+5% synergy
Kessig Wolf Run
16% of 133 decks
-0% synergy
Boseiju, Who Endures
15% of 133 decks
-4% synergy
Sunhome, Fortress of the Legion
13% of 678 decks
+8% synergy
Slayers' Stronghold
13% of 678 decks
+7% synergy
Academy Ruins
13% of 95 decks
+8% synergy
War Room
12% of 678 decks
+6% synergy
Scavenger Grounds
12% of 678 decks
+9% synergy
Temple of the False God
12% of 678 decks
+2% synergy
Eiganjo, Seat of the Empire
11% of 678 decks
+3% synergy
Hall of Heliod's Generosity
11% of 678 decks
+4% synergy
Otawara, Soaring City
9% of 95 decks
-7% synergy
Throne of the High City
9% of 678 decks
+9% synergy
Axgard Armory
9% of 678 decks
+6% synergy
Phyrexian Tower
9% of 227 decks
+0% synergy
Mistveil Plains
9% of 678 decks
+7% synergy
Needle Spires
8% of 678 decks
+7% synergy
Castle Ardenvale
8% of 678 decks
+3% synergy
Maze of Ith
8% of 678 decks
+5% synergy
Access Tunnel
8% of 678 decks
+5% synergy
Command Beacon
7% of 678 decks
+3% synergy
Minamo, School at Water's Edge
7% of 95 decks
+3% synergy
Arena of Glory
7% of 464 decks
+1% synergy
Spinerock Knoll
7% of 678 decks
+3% synergy
Shizo, Death's Storehouse
6% of 227 decks
+2% synergy
Labyrinth of Skophos
6% of 678 decks
+6% synergy
Takenuma, Abandoned Mire
6% of 227 decks
-4% synergy
Kher Keep
5% of 678 decks
+3% synergy
Minas Tirith
5% of 656 decks
-2% synergy
High Market
5% of 678 decks
+3% synergy
Desolate Lighthouse
5% of 95 decks
+1% synergy
Mystic Sanctuary
5% of 95 decks
-6% synergy
Urborg, Tomb of Yawgmoth
5% of 678 decks
-4% synergy
Mana Artifacts
Sol Ring
89% of 678 decks
+5% synergy
Arcane Signet
87% of 678 decks
+15% synergy
Talisman of Conviction
52% of 678 decks
+28% synergy
Talisman of Hierarchy
49% of 227 decks
+24% synergy
Boros Signet
48% of 678 decks
+25% synergy
Talisman of Indulgence
45% of 227 decks
+18% synergy
Orzhov Signet
43% of 227 decks
+16% synergy
Rakdos Signet
40% of 227 decks
+11% synergy
Izzet Signet
37% of 95 decks
+9% synergy
Fellwar Stone
36% of 678 decks
+15% synergy
Talisman of Progress
31% of 95 decks
+6% synergy
Azorius Signet
31% of 95 decks
+5% synergy
Talisman of Creativity
31% of 95 decks
+2% synergy
Thought Vessel
21% of 678 decks
+3% synergy
Chromatic Lantern
16% of 678 decks
+6% synergy
Gruul Signet
15% of 133 decks
+3% synergy
Selesnya Signet
14% of 133 decks
+5% synergy
Talisman of Unity
10% of 133 decks
+2% synergy
Gilded Lotus
9% of 678 decks
+5% synergy
Misleading Signpost
8% of 85 decks
+7% synergy
Talisman of Impulse
8% of 133 decks
-2% synergy
Coveted Jewel
6% of 678 decks
+5% synergy
Cursed Mirror
6% of 678 decks
+1% synergy
Relic of Legends
6% of 678 decks
+3% synergy
Pyromancer's Goggles
5% of 678 decks
+4% synergy
Lands
Command Tower
91% of 678 decks
+17% synergy
Jetmir's Garden
62% of 133 decks
+31% synergy
Clifftop Retreat
56% of 678 decks
+26% synergy
Temple Garden
55% of 133 decks
+15% synergy
Nomad Outpost
54% of 227 decks
+26% synergy
Stomping Ground
53% of 133 decks
+12% synergy
Savai Triome
52% of 227 decks
+26% synergy
Godless Shrine
51% of 227 decks
+10% synergy
Battlefield Forge
50% of 678 decks
+24% synergy
Indatha Triome
50% of 18 decks
+20% synergy
Hallowed Fountain
49% of 95 decks
+9% synergy
Blood Crypt
49% of 227 decks
+11% synergy
Exotic Orchard
49% of 678 decks
+13% synergy
Jungle Shrine
49% of 133 decks
+16% synergy
Sacred Foundry
49% of 678 decks
+13% synergy
Steam Vents
48% of 95 decks
+10% synergy
Raugrin Triome
47% of 95 decks
+21% synergy
Mystic Monastery
47% of 95 decks
+20% synergy
Caves of Koilos
45% of 227 decks
+16% synergy
Spectator Seating
44% of 678 decks
+19% synergy
Vault of Champions
44% of 227 decks
+18% synergy
Ketria Triome
43% of 21 decks
+11% synergy
Cinder Glade
43% of 133 decks
+4% synergy
Glacial Fortress
42% of 95 decks
+14% synergy
Luxury Suite
41% of 227 decks
+15% synergy
Prairie Stream
41% of 95 decks
+7% synergy
Isolated Chapel
40% of 227 decks
+10% synergy
Bountiful Promenade
38% of 133 decks
+14% synergy
Shivan Reef
37% of 95 decks
+9% synergy
Dragonskull Summit
36% of 227 decks
+4% synergy
Sunpetal Grove
36% of 133 decks
+12% synergy
Rootbound Crag
36% of 133 decks
+11% synergy
Boros Garrison
35% of 678 decks
+20% synergy
Spire Garden
35% of 133 decks
+11% synergy
Sulfurous Springs
34% of 227 decks
+13% synergy
Training Center
34% of 95 decks
+7% synergy
Arid Mesa
34% of 678 decks
+23% synergy
Raffine's Tower
33% of 21 decks
+7% synergy
Ziatora's Proving Ground
33% of 18 decks
+3% synergy
Overgrown Tomb
33% of 18 decks
-8% synergy
Canopy Vista
33% of 133 decks
-4% synergy
Rugged Prairie
32% of 678 decks
+21% synergy
Sulfur Falls
32% of 95 decks
-1% synergy
Sea of Clouds
29% of 95 decks
+3% synergy
Sundown Pass
29% of 678 decks
+14% synergy
Temple of Triumph
29% of 678 decks
+12% synergy
Xander's Lounge
29% of 21 decks
+3% synergy
Spara's Headquarters
29% of 21 decks
-1% synergy
The World Tree
29% of 14 decks
-3% synergy
Watery Grave
29% of 21 decks
-12% synergy