the front side of Yahenni, Undying Partisan
the back of a classic MtG card
the front side of Agatha's Soul Cauldron
the back of a classic MtG card
the front side of Triskelion
the back of a classic MtG card

Color Identity: B

Initial Card State

  1.  Triskelion in exile (exiled by Agatha's Soul Cauldron).
  2.  Yahenni and Agatha's Soul Cauldron on the battlefield.

Notable Prerequisites

  1. Yahenni has at least one +1/+1 counter on it.
  2. You have a way to give Yahenni deathtouch.

Steps

  1. Give Yahenni deathtouch, if needed.
  2. Activate Yahenni using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to a creature an opponent controls, and destroying it due to Yahenni's deathtouch.
  3. Yahenni triggers, putting a +1/+1 counter on it.
  4. Repeat from step 2.
  5. If you can give Yahenni deathtouch indefinitely, you may repeat this loop whenever a creature enters the battlefield under an opponent's control.

Results

  1. Destroy all creatures opponents control.
  2. Destroy each creature that enters the battlefield under an opponent's control.
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