Color Identity: B, G, U

Prerequisites

  1.  All permanents on the battlefield.
  2. Archelos, Lagoon Mystic
    Archelos     is tapped.
  3. Royal Assassin
    Royal Assassin     does not have summoning sickness.
  4. 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
    Archelos, Lagoon Mystic
    Archelos    .
  2. Holding priority, activate
    Royal Assassin
    Royal Assassin     by tapping it, destroying the creature.
  3. The creature dies, triggering
    Royal Assassin
    Royal Assassin    , untapping
    Royal Assassin
    Royal Assassin    .
  4. Repeat.

Results

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

Metadata

  1. In 10 decks according to EDHREC.
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