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.
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
0.08% of 4761 decks 4 decks
Meren of Clan Nel Toth
0.01% of 14631 decks 2 decks
Kenrith, the Returned King
0.01% of 20601 decks 2 decks
Tayam, Luminous Enigma
0.02% of 5630 decks 1 decks
Francisco, Fowl Marauder // Tevesh Szat, Doom of Fools
2.86% of 35 decks 1 decks
Marchesa, the Black Rose
0.01% of 8956 decks 1 decks
Grenzo, Dungeon Warden
0.03% of 3087 decks 1 decks
Reyhan, Last of the Abzan // Rograkh, Son of Rohgahh
0.17% of 588 decks 1 decks
Massacre Girl, Known Killer
0.02% of 5189 decks 1 decks
Glarb, Calamity's Augur
0.01% of 9435 decks 1 decks
Mikaeus, the Unhallowed
0.07% of 1364 decks 1 decks
Syr Konrad, the Grim
0.02% of 4219 decks 1 decks
Jadar, Ghoulcaller of Nephalia
0.20% of 488 decks 1 decks
Chatterfang, Squirrel General
0.01% of 16565 decks 1 decks
Ziatora, the Incinerator
0.01% of 7472 decks 1 decks
High Synergy Cards
Strangleroot Geist
67% of 9 decks +66% synergy
Young Wolf
67% of 9 decks +66% synergy
Worldly Tutor
78% of 9 decks +64% synergy
Zulaport Cutthroat
70% of 20 decks +61% synergy
Geralf's Messenger
60% of 20 decks +60% synergy
Entomb
65% of 20 decks +58% synergy
Blood Artist
65% of 20 decks +53% synergy
Walking Ballista
55% of 20 decks +53% synergy
Mikaeus, the Unhallowed
55% of 20 decks +52% synergy
Yawgmoth, Thran Physician
55% of 20 decks +52% synergy
Top Cards
Dark Ritual
65% of 20 decks +42% synergy
Birds of Paradise
56% of 9 decks +28% synergy
Ashnod's Altar
55% of 20 decks +48% synergy
Gray Merchant of Asphodel
55% of 20 decks +46% synergy
Diabolic Intent
50% of 20 decks +42% synergy
Reanimate
50% of 20 decks +33% synergy
Ayara, First of Locthwain
45% of 20 decks +41% synergy
Buried Alive
45% of 20 decks +39% synergy
Spike Feeder
44% of 9 decks +44% synergy
Devoted Druid
44% of 9 decks +41% synergy
Game Changers
Enlightened Tutor
100% of 3 decks +83% synergy
Vampiric Tutor
50% of 20 decks +33% synergy
Demonic Tutor
35% of 20 decks +14% synergy
Bolas's Citadel
30% of 20 decks +21% synergy
Ancient Tomb
25% of 20 decks +15% synergy
Chrome Mox
20% of 20 decks +14% synergy
Mana Vault
15% of 20 decks +9% synergy
Creatures
Agatha of the Vile Cauldron
75% of 4 decks +74% synergy
Ob Nixilis, Captive Kingpin
50% of 6 decks +49% synergy
Kiki-Jiki, Mirror Breaker
50% of 6 decks +47% synergy
Llanowar Elves
44% of 9 decks +24% synergy
Pawn of Ulamog
40% of 20 decks +38% synergy
Pitiless Plunderer
40% of 20 decks +32% synergy
Viscera Seer
40% of 20 decks +31% synergy
Reassembling Skeleton
35% of 20 decks +31% synergy
Protean Hulk
33% of 9 decks +32% synergy
Eternal Witness
33% of 9 decks +14% synergy
Sifter of Skulls
30% of 20 decks +29% synergy
Carrion Feeder
30% of 20 decks +25% synergy
Warren Soultrader
30% of 10 decks +25% synergy
Syr Konrad, the Grim
30% of 20 decks +21% synergy
Mirkwood Bats
30% of 20 decks +20% synergy
Deathgreeter
25% of 20 decks +24% synergy
K'rrik, Son of Yawgmoth
25% of 20 decks +23% synergy
Gravecrawler
25% of 20 decks +22% synergy
Orcish Bowmasters
25% of 20 decks +16% synergy
Sightless Ghoul
20% of 20 decks +20% synergy
Necroskitter
20% of 20 decks +19% synergy
Putrid Goblin
20% of 20 decks +19% synergy
Woe Strider
20% of 20 decks +18% synergy
Ophiomancer
20% of 20 decks +17% synergy
Crypt Ghast
20% of 20 decks +15% synergy
Cryptic Trilobite
15% of 20 decks +15% synergy
Blood Pet
15% of 20 decks +14% synergy
Metallic Mimic
15% of 20 decks +14% synergy
Dark Confidant
15% of 20 decks +13% synergy
Leaden Myr
15% of 20 decks +13% synergy
Jadar, Ghoulcaller of Nephalia
15% of 20 decks +13% synergy
Drivnod, Carnage Dominus
15% of 20 decks +13% synergy
Stitcher's Supplier
15% of 20 decks +12% synergy
Grim Haruspex
15% of 20 decks +11% synergy
Plaguecrafter
15% of 20 decks +10% synergy
Braids, Arisen Nightmare
15% of 20 decks +8% synergy
Solemn Simulacrum
15% of 20 decks +1% synergy
Instants
Deflecting Swat
50% of 6 decks +34% synergy
Chord of Calling
44% of 9 decks +39% synergy
Veil of Summer
33% of 9 decks +28% synergy
Deadly Rollick
30% of 20 decks +19% synergy
Defile
25% of 20 decks +22% synergy
Vraska's Fall
20% of 20 decks +18% synergy
Culling the Weak
20% of 20 decks +16% synergy
Corrupted Conviction
20% of 20 decks +15% synergy
Village Rites
20% of 20 decks +10% synergy
Deadly Dispute
20% of 20 decks +9% synergy
Snuff Out
15% of 20 decks +13% synergy
Cabal Ritual
15% of 20 decks +10% synergy
Sorceries
Gamble
50% of 6 decks +40% synergy
Finale of Devastation
44% of 9 decks +36% synergy
Feed the Swarm
40% of 20 decks +23% synergy
Toxic Deluge
35% of 20 decks +17% synergy
Eldritch Evolution
33% of 9 decks +29% synergy
Culling Ritual
33% of 9 decks +22% synergy
Rampant Growth
33% of 9 decks -1% synergy
Cultivate
33% of 9 decks -12% synergy
Victimize
30% of 20 decks +18% synergy
Unmarked Grave
25% of 20 decks +23% synergy
Damnation
25% of 20 decks +18% synergy
Profane Tutor
20% of 20 decks +18% synergy
Dread Return
20% of 20 decks +15% synergy
Unearth
15% of 20 decks +12% synergy
Grim Tutor
15% of 20 decks +11% synergy
Sign in Blood
15% of 20 decks +6% synergy
Utility Artifacts
Phyrexian Altar
35% of 20 decks +31% synergy
Wishclaw Talisman
30% of 20 decks +25% synergy
Skullclamp
30% of 20 decks +18% synergy
Lightning Greaves
30% of 20 decks +5% synergy
Bontu's Monument
25% of 20 decks +23% synergy
Jet Medallion
25% of 20 decks +22% synergy
Desecrated Tomb
15% of 20 decks +15% synergy
Genesis Chamber
15% of 20 decks +14% synergy
Altar of Dementia
15% of 20 decks +12% synergy
Jeweled Lotus
15% of 20 decks +11% synergy
Swiftfoot Boots
15% of 20 decks -12% synergy
Enchantments
Insidious Roots
50% of 6 decks +44% synergy
The Meathook Massacre
40% of 20 decks +35% synergy
Nest of Scarabs
35% of 20 decks +34% synergy
Bastion of Remembrance
35% of 20 decks +29% synergy
Grave Pact
25% of 20 decks +20% synergy
Animate Dead
25% of 20 decks +16% synergy
Phyrexian Arena
20% of 20 decks +4% synergy
Retribution of the Ancients
15% of 20 decks +14% synergy
Necropotence
15% of 20 decks +10% synergy
Planeswalkers
Grist, the Hunger Tide
33% of 9 decks +29% synergy
Utility Lands
Boseiju, Who Endures
56% of 9 decks +37% synergy
Phyrexian Tower
45% of 20 decks +36% synergy
Cabal Coffers
45% of 20 decks +35% synergy
Bojuka Bog
40% of 20 decks +10% synergy
Takenuma, Abandoned Mire
35% of 20 decks +25% synergy
Dryad Arbor
33% of 9 decks +29% synergy
Witch's Cottage
25% of 20 decks +21% synergy
Urborg, Tomb of Yawgmoth
25% of 20 decks +16% synergy
Reliquary Tower
25% of 20 decks -5% synergy
Cabal Stronghold
20% of 20 decks +17% synergy
Mortuary Mire
20% of 20 decks +15% synergy
Urza's Saga
20% of 20 decks +13% synergy
Hive of the Eye Tyrant
15% of 20 decks +15% synergy
Blast Zone
15% of 20 decks +14% synergy
Inventors' Fair
15% of 20 decks +11% synergy
Nykthos, Shrine to Nyx
15% of 20 decks +10% synergy
Mana Artifacts
Sol Ring
100% of 20 decks +16% synergy
Arcane Signet
90% of 20 decks +18% synergy
Rakdos Signet
50% of 6 decks +21% synergy
Golgari Signet
33% of 9 decks +21% synergy
Fellwar Stone
25% of 20 decks +4% synergy
Thought Vessel
20% of 20 decks +3% synergy
Throne of Eldraine
15% of 20 decks +13% synergy
Mox Amber
15% of 20 decks +11% synergy
Lands
Temple Garden
100% of 3 decks +60% synergy
Godless Shrine
100% of 3 decks +60% synergy
Breeding Pool
100% of 3 decks +60% synergy
Overgrown Tomb
78% of 9 decks +36% synergy
Watery Grave
75% of 4 decks +35% synergy
Stomping Ground
75% of 4 decks +35% synergy
Blood Crypt
67% of 6 decks +29% synergy
Undergrowth Stadium
56% of 9 decks +30% synergy
Llanowar Wastes
56% of 9 decks +30% synergy
Command Tower
55% of 20 decks -19% synergy
Bayou
33% of 9 decks +20% synergy
Bloodstained Mire
30% of 20 decks +19% synergy
Verdant Catacombs
30% of 20 decks +19% synergy
Wooded Foothills
25% of 20 decks +15% synergy
Exotic Orchard
25% of 20 decks -11% synergy
Misty Rainforest
20% of 20 decks +8% synergy
Forbidden Orchard
15% of 20 decks +12% synergy
Cavern of Souls
15% of 20 decks +8% synergy
Mana Confluence
15% of 20 decks +8% synergy
Fabled Passage
15% of 20 decks +6% synergy
Flooded Strand
15% of 20 decks +4% synergy
Polluted Delta
15% of 20 decks +4% synergy
Evolving Wilds
15% of 20 decks -6% synergy