Color Identity: W, U, B, R, G

Prerequisites

  1.  All permanents on the battlefield.
  2. You have a way to cause a creature to enter the battlefield.
  3. "Scarecrow" chosen with
    Arcane Adaptation
    Arcane Adaptation
    .

Steps

  1. Cause a creature to enter the battlefield.
  2. Reaper King
    Reaper King
    triggers, destroying target nontoken creature an opponent controls.
  3. The creature dies, triggering
    Overseer of the Damned
    Overseer of the Damned
    , creating a 2/2 Zombie creature token.
  4. The Zombie enters the battlefield as a Scarecrow due to
    Arcane Adaptation
    Arcane Adaptation
    , triggering
    Reaper King
    Reaper King
    , destroying target nontoken creature an opponent controls.
  5. Repeat from step 3.
  6. This loop will also repeat whenever another creature enters the battlefield under your control.

Results

  1. Destroy all nontoken creatures opponents control whenever a creature enters the battlefield under your control.

Metadata

  1. In 23 decks according to EDHREC.
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