Agatha's Soul Cauldron + Triskelion + Butcher Ghoul

Agatha's Soul Cauldron
Triskelion
Butcher Ghoul

Requires
Agatha's Soul Cauldron must be on the battlefield. Triskelion must be in exile (exiled by Agatha's Soul Cauldron). Butcher Ghoul must be on the battlefield. Butcher Ghoul has at least one +1/+1 counter on it.
Steps
  1. Activate Butcher Ghoul using Triskelion's ability by removing a +1/+1 counter from it.
  2. Repeat step 1 until Butcher Ghoul has no +1/+1 counters on it.
  3. Resolve all Butcher Ghoul abilities dealing 1 damage to Butcher Ghoul, and any remaining damage to any target(s).
  4. Butcher Ghoul dies as a state-based action due to having 0 toughness.
  5. Butcher Ghoul's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB.

Yawgmoth, Thran Physician
0.05% of 5579 decks 3 decks
Meren of Clan Nel Toth
0.01% of 14168 decks 2 decks
Top Cards
Birds of Paradise
83% of 6 decks +71% synergy
Entomb
75% of 16 decks +71% synergy
Dark Ritual
75% of 16 decks +64% synergy
Geralf's Messenger
69% of 16 decks +69% synergy
Diabolic Intent
69% of 16 decks +64% synergy
Zulaport Cutthroat
69% of 16 decks +63% synergy
Strangleroot Geist
67% of 6 decks +67% synergy
Young Wolf
67% of 6 decks +66% synergy
Worldly Tutor
67% of 6 decks +60% synergy
Llanowar Elves
67% of 6 decks +57% synergy
Creatures
Mikaeus, the Unhallowed
62% of 16 decks +61% synergy
Blood Artist
62% of 16 decks +56% synergy
Yawgmoth, Thran Physician
56% of 16 decks +54% synergy
Walking Ballista
56% of 16 decks +54% synergy
Gray Merchant of Asphodel
56% of 16 decks +52% synergy
Protean Hulk
50% of 6 decks +49% synergy
Ayara, First of Locthwain
50% of 16 decks +48% synergy
Viscera Seer
50% of 16 decks +45% synergy
Pawn of Ulamog
38% of 16 decks +36% synergy
Reassembling Skeleton
38% of 16 decks +36% synergy
Carrion Feeder
38% of 16 decks +35% synergy
Pitiless Plunderer
38% of 16 decks +34% synergy
Sifter of Skulls
31% of 16 decks +31% synergy
Gravecrawler
31% of 16 decks +30% synergy
Mirkwood Bats
31% of 16 decks +25% synergy
Deathgreeter
25% of 16 decks +25% synergy
Woe Strider
25% of 16 decks +24% synergy
Jadar, Ghoulcaller of Nephalia
25% of 16 decks +24% synergy
Ophiomancer
25% of 16 decks +24% synergy
Syr Konrad, the Grim
25% of 16 decks +20% synergy
Sightless Ghoul
19% of 16 decks +19% synergy
Putrid Goblin
19% of 16 decks +18% synergy
Tormod, the Desecrator
19% of 16 decks +18% synergy
Blood Pet
19% of 16 decks +18% synergy
K'rrik, Son of Yawgmoth
19% of 16 decks +18% synergy
Leaden Myr
19% of 16 decks +18% synergy
Dark Confidant
19% of 16 decks +18% synergy
Vile Entomber
19% of 16 decks +18% synergy
Stitcher's Supplier
19% of 16 decks +17% synergy
Drivnod, Carnage Dominus
19% of 16 decks +17% synergy
Grim Haruspex
19% of 16 decks +16% synergy
Crypt Ghast
19% of 16 decks +16% synergy
Plaguecrafter
19% of 16 decks +16% synergy
Braids, Arisen Nightmare
19% of 16 decks +15% synergy
Orcish Bowmasters
19% of 16 decks +13% synergy
Solemn Simulacrum
19% of 16 decks +5% synergy
Instants
Enlightened Tutor
100% of 3 decks +92% synergy
Deflecting Swat
75% of 4 decks +67% synergy
Chord of Calling
50% of 6 decks +47% synergy
Vampiric Tutor
44% of 16 decks +34% synergy
Defile
31% of 16 decks +29% synergy
Deadly Rollick
31% of 16 decks +26% synergy
Culling the Weak
25% of 16 decks +23% synergy
Cabal Ritual
25% of 16 decks +23% synergy
Corrupted Conviction
25% of 16 decks +22% synergy
Village Rites
25% of 16 decks +20% synergy
Deadly Dispute
25% of 16 decks +19% synergy
Snuff Out
19% of 16 decks +18% synergy
Vraska's Fall
19% of 16 decks +17% synergy
Sorceries
Reanimate
62% of 16 decks +55% synergy
Buried Alive
56% of 16 decks +53% synergy
Eldritch Evolution
50% of 6 decks +48% synergy
Culling Ritual
50% of 6 decks +48% synergy
Victimize
38% of 16 decks +32% synergy
Toxic Deluge
38% of 16 decks +29% synergy
Feed the Swarm
38% of 16 decks +28% synergy
Demonic Tutor
38% of 16 decks +26% synergy
Unmarked Grave
31% of 16 decks +30% synergy
Dread Return
25% of 16 decks +22% synergy
Damnation
25% of 16 decks +21% synergy
Profane Tutor
19% of 16 decks +17% synergy
Grim Tutor
19% of 16 decks +16% synergy
Imperial Seal
19% of 16 decks +16% synergy
Sign in Blood
19% of 16 decks +14% synergy
Utility Artifacts
Ashnod's Altar
62% of 16 decks +55% synergy
Phyrexian Altar
38% of 16 decks +33% synergy
Skullclamp
38% of 16 decks +25% synergy
Wishclaw Talisman
31% of 16 decks +28% synergy
Bolas's Citadel
31% of 16 decks +26% synergy
Bontu's Monument
25% of 16 decks +23% synergy
Lightning Greaves
25% of 16 decks -0% synergy
Jet Medallion
19% of 16 decks +16% synergy
Enchantments
The Meathook Massacre
50% of 16 decks +47% synergy
Bastion of Remembrance
38% of 16 decks +34% synergy
Animate Dead
38% of 16 decks +33% synergy
Nest of Scarabs
31% of 16 decks +31% synergy
Grave Pact
25% of 16 decks +23% synergy
Phyrexian Arena
25% of 16 decks +18% synergy
Necromancy
19% of 16 decks +17% synergy
Necropotence
19% of 16 decks +16% synergy
Utility Lands
Boseiju, Who Endures
67% of 6 decks +57% synergy
Phyrexian Tower
56% of 16 decks +52% synergy
Cabal Coffers
50% of 16 decks +44% synergy
Bojuka Bog
50% of 16 decks +34% synergy
Takenuma, Abandoned Mire
38% of 16 decks +32% synergy
Urborg, Tomb of Yawgmoth
38% of 16 decks +27% synergy
Ancient Tomb
31% of 16 decks +21% synergy
Witch's Cottage
25% of 16 decks +23% synergy
Reliquary Tower
25% of 16 decks -4% synergy
Hive of the Eye Tyrant
19% of 16 decks +18% synergy
Cabal Stronghold
19% of 16 decks +17% synergy
Mortuary Mire
19% of 16 decks +16% synergy
Urza's Saga
19% of 16 decks +12% synergy
Mana Artifacts
Sol Ring
100% of 16 decks +16% synergy
Arcane Signet
88% of 16 decks +16% synergy
Rakdos Signet
75% of 4 decks +68% synergy
Jeweled Lotus
25% of 16 decks +17% synergy
Fellwar Stone
25% of 16 decks +4% synergy
Mox Diamond
19% of 16 decks +14% synergy
Mana Vault
19% of 16 decks +12% synergy
Chrome Mox
19% of 16 decks +12% synergy
Mana Crypt
19% of 16 decks +8% synergy
Thought Vessel
19% of 16 decks +2% synergy
Lands
Godless Shrine
100% of 3 decks +91% synergy
Llanowar Wastes
83% of 6 decks +78% synergy
Undergrowth Stadium
83% of 6 decks +78% synergy
Overgrown Tomb
83% of 6 decks +74% synergy
Blood Crypt
75% of 4 decks +66% synergy
Command Tower
69% of 16 decks -5% synergy
Bloodstained Mire
31% of 16 decks +21% synergy
Verdant Catacombs
31% of 16 decks +20% synergy
Exotic Orchard
25% of 16 decks -10% synergy
Cavern of Souls
19% of 16 decks +12% synergy
Fabled Passage
19% of 16 decks +10% synergy
Misty Rainforest
19% of 16 decks +7% synergy