Color Identity: W, B, G

Prerequisites

  1.  All permanents on the battlefield.
  2. Royal Assassin
    Royal Assassin     does not have summoning sickness.
  3. Thornbite Staff
    Thornbite Staff     attached to
    Royal Assassin
    Royal Assassin    .

Steps

  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Thalia and the Gitrog Monster.
  2. Holding priority, activate
    Royal Assassin
    Royal Assassin     by tapping it, destroying the creature.
  3. When the creature dies,
    Royal Assassin
    Royal Assassin     triggers, untapping
    Royal Assassin
    Royal Assassin    .
  4. Repeat.

Results

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

Metadata

  1. In 40 decks according to EDHREC.
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