Agatha's Soul Cauldron + Triskelion + Strangleroot Geist

Agatha's Soul Cauldron
Triskelion
Strangleroot Geist

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

Lonis, Genetics Expert
0.41% of 492 decks 2 decks
Volrath, the Shapestealer
0.08% of 2631 decks 2 decks
High Synergy Cards
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87% of 15 decks +86% synergy
Walking Ballista
80% of 15 decks +77% synergy
Yawgmoth, Thran Physician
67% of 12 decks +65% synergy
Viscera Seer
67% of 12 decks +62% synergy
Top Cards
Birds of Paradise
60% of 15 decks +48% synergy
Mikaeus, the Unhallowed
58% of 12 decks +57% synergy
Devoted Druid
53% of 15 decks +52% synergy
Chord of Calling
53% of 15 decks +51% synergy
Ashnod's Altar
47% of 15 decks +39% synergy
Llanowar Elves
47% of 15 decks +37% synergy
Hapatra, Vizier of Poisons
42% of 12 decks +42% synergy
Geralf's Messenger
42% of 12 decks +41% synergy
Grist, the Hunger Tide
42% of 12 decks +41% synergy
Diabolic Intent
42% of 12 decks +37% synergy
Creatures
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60% of 5 decks +59% synergy
Phyrexian Metamorph
60% of 5 decks +57% synergy
Zulaport Cutthroat
42% of 12 decks +36% synergy
Butcher Ghoul
33% of 12 decks +33% synergy
Fiend Artisan
33% of 12 decks +33% synergy
Incubation Druid
33% of 15 decks +31% synergy
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33% of 12 decks +31% synergy
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33% of 12 decks +31% synergy
Orcish Bowmasters
33% of 12 decks +28% synergy
Blood Artist
33% of 12 decks +27% synergy
Eternal Witness
33% of 15 decks +23% synergy
Protean Hulk
27% of 15 decks +26% synergy
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27% of 15 decks +26% synergy
Champion of Lambholt
27% of 15 decks +23% synergy
Delighted Halfling
27% of 15 decks +20% synergy
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25% of 12 decks +24% synergy
Gravecrawler
25% of 12 decks +24% synergy
Deathrite Shaman
25% of 12 decks +22% synergy
Experiment One
20% of 15 decks +20% synergy
Wall of Roots
20% of 15 decks +20% synergy
Karametra's Acolyte
20% of 15 decks +19% synergy
Haywire Mite
20% of 15 decks +18% synergy
Kami of Whispered Hopes
20% of 15 decks +16% synergy
Fyndhorn Elves
20% of 15 decks +14% synergy
Instants
Mana Drain
60% of 5 decks +52% synergy
Fierce Guardianship
60% of 5 decks +51% synergy
Cyclonic Rift
60% of 5 decks +46% synergy
Vampiric Tutor
42% of 12 decks +32% synergy
Worldly Tutor
40% of 15 decks +33% synergy
Entomb
33% of 12 decks +30% synergy
Deadly Dispute
25% of 12 decks +19% synergy
Assassin's Trophy
25% of 12 decks +19% synergy
Dark Ritual
25% of 12 decks +14% synergy
Sorceries
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60% of 5 decks +57% synergy
Demonic Tutor
42% of 12 decks +30% synergy
Eldritch Evolution
40% of 15 decks +38% synergy
Culling Ritual
33% of 12 decks +31% synergy
Damnation
33% of 12 decks +29% synergy
Green Sun's Zenith
27% of 15 decks +24% synergy
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25% of 12 decks +25% synergy
Buried Alive
25% of 12 decks +22% synergy
Reanimate
25% of 12 decks +17% synergy
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20% of 15 decks +5% synergy
Rampant Growth
20% of 15 decks +4% synergy
Utility Artifacts
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33% of 15 decks +30% synergy
Skullclamp
27% of 15 decks +14% synergy
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27% of 15 decks +1% synergy
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25% of 12 decks +23% synergy
Birthing Pod
20% of 15 decks +19% synergy
Phyrexian Altar
20% of 15 decks +16% synergy
The Great Henge
20% of 15 decks +15% synergy
Enchantments
Hardened Scales
20% of 15 decks +16% synergy
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20% of 15 decks +16% synergy
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20% of 15 decks +14% synergy
Planeswalkers
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Utility Lands
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40% of 15 decks +31% synergy
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27% of 15 decks +25% synergy
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20% of 15 decks +18% synergy
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20% of 15 decks +11% synergy
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93% of 15 decks +22% synergy
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80% of 15 decks -4% synergy
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33% of 15 decks +12% synergy
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25% of 12 decks +23% synergy
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25% of 12 decks +22% synergy
Lands
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100% of 3 decks +91% synergy
Breeding Pool
80% of 5 decks +71% synergy
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50% of 12 decks +48% synergy
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Exotic Orchard
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27% of 15 decks +15% synergy
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27% of 15 decks +5% synergy
Tainted Wood
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Gemstone Mine
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Polluted Delta
20% of 15 decks +9% synergy