Royal Assassin + Frozen Aether + Thornbite Staff

Royal Assassin
Frozen Aether
Thornbite Staff

Requires
Royal Assassin must be on the battlefield. Frozen Aether must be on the battlefield. Thornbite Staff must be on the battlefield. Royal Assassin does not have summoning sickness. Thornbite Staff attached to Royal Assassin.
Steps
  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Frozen Aether.
  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
Destroy all creatures that enter the battlefield under an opponent's control.

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