Crystalline Crawler
Evolution Witness
Cathars' Crusade
Yahenni, Undying Partisan

   Prerequisites

What do I need to start this combo?
Creature with MV<=1 in hand.
All other permanents on the battlefield.
You have enough mana to cast the creature with mana value 1 or less

   Steps

How does this combo work?
1
Cast the creature with mana value 1 or less from your hand by paying its mana cost.
2
When the creature enters, Cathars' Crusade triggers.
3
Holding priority, activate Yahenni by sacrificing the creature.
4
Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control.
5
Evolution Witness triggers, returning the creature with mana value 1 or less from your graveyard to your hand.
6
Activate Crystalline Crawler by removing a +1/+1 counter from it, adding one mana of any color.
7
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite storm count
Infinite +1/+1 counters on creatures you control
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