the front side of Cathars' Crusade
the back of a classic MtG card
the front side of Aerie Ouphes
the back of a classic MtG card

Color Identity: G, W

Initial Card State

  1.  Cathars' Crusade and Aerie Ouphes on the battlefield.

Notable Prerequisites

  1. An additional creature with flying and indestructible on the battlefield.

Steps

  1. Activate Aerie Ouphes' ability by sacrificing itself to deal 4 damage to the creature with flying and indestructible.
  2. Aerie Ouphes's Persist ability triggers, returning Aerie Ouphes from your graveyard to the battlefield with a -1/-1 counter on it.
  3. Cathars' Crusade triggers, putting a +1/+1 counter on all creatures you control.
  4. The -1/-1 counter and +1/+1 counter on Aerie Ouphes are removed as a state-based action.
  5. Repeat.

Results

  1. Infinite death triggers.
  2. Infinite ETB.
  3. Infinite LTB.
  4. Infinite sacrifice triggers.
  5. Infinite +1/+1 counters.

Metadata

  1. In 102 decks according to EDHREC.
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