Moritte of the Frost + Yahenni, Undying Partisan

Moritte of the Frost
Yahenni, Undying Partisan

Requires
Moritte of the Frost must be on the battlefield (as a copy of the creature with persist.). Yahenni, Undying Partisan must be on the battlefield.
Steps
  1. Activate Yahenni by sacrificing Moritte of the Frost.
  2. When Moritte of the Frost dies, it triggers its persist ability, returning itself to the battlefield as a copy of the creature with persist with two +1/+1 counters and one -1/-1 counter on it.
  3. Remove one +1/+1 counter and one -1/-1 counter from Moritte of the Frost as a state-based action.
  4. Resolve the activated ability from step 1, giving Yahenna indestructible until end of turn.
  5. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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