the front side of Royal Assassin
the back of a classic MtG card
the front side of Urabrask the Hidden
the back of a classic MtG card
the front side of Thornbite Staff
the back of a classic MtG card

Color Identity: B, R

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. Thornbite Staff attached to Royal Assassin.

Steps

  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Urabrask.
  2. Holding priority, activate Royal Assassin by tapping it, destroying the creature.
  3. The creature dies, triggering Royal Assassin, untapping Royal Assassin.
  4. Repeat.

Results

  1. Destroy all creatures that enter the battlefield under an opponent's control.

Metadata

  1. In 8 decks according to EDHREC.
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