Colfenor, the Last Yew
Gutter Grime
Yahenni, Undying Partisan

   Prerequisites

What do I need to start this combo?
Creature castable for 0 in hand.
All other permanents on the battlefield.
Gutter Grime has slime counters on it at least equal to the toughness of the creature card in your hand.

   Steps

How does this combo work?
1
Cast the creature card in your hand by paying 0.
2
Either that creature dies as a state-based action due to having zero toughness, or activate Yahenni by sacrificing that creature.
3
Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
4
Activate Yahenni by sacrificing the Ooze.
5
When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand.
6
Resolve the Yahenni abilities, giving Yahenni indestructible until end of turn.
7
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite storm count
Infinite creature tokens that are infinitely large
Sakura-Tribe Elder
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Viscera Seer
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Blood Artist
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Pitiless Plunderer
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Teysa Karlov
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Bartolomé del Presidio
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Blood Pet
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Bloodthrone Vampire
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Caustic Caterpillar
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Elas il-Kor, Sadistic Pilgrim
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Hangarback Walker
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Luminous Broodmoth
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Reclamation Sage
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Ao, the Dawn Sky
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