Intruder Alarm + Royal Assassin Combos

3 known combos featuring both cards in Commander

Destroy each creature that enters the battlefield under an opponent's control Lock

Combo 1 with Frozen Aether

Also requires: Frozen Aether Frozen Aether
Results: Destroy each creature that enters the battlefield under an opponent's control · Lock
Steps
  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Frozen Aether and triggers Intruder Alarm.
  2. Holding priority, activate Royal Assassin by tapping it, destroying the creature.
  3. Resolve the Intruder Alarm trigger, untapping all creatures.
  4. Repeat.

Combo 2 with Urabrask the Hidden

Also requires: Urabrask the Hidden Urabrask the Hidden
Results: Destroy each creature that enters the battlefield under an opponent's control · Lock
Show steps
  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Urabrask and triggers Intruder Alarm.
  2. Holding priority, activate Royal Assassin by tapping it, destroying the creature.
  3. Resolve the Intruder Alarm trigger, untapping all creatures.
  4. Repeat.

Combo 3 with Orb of Dreams

Also requires: Orb of Dreams Orb of Dreams
Results: Destroy each creature that enters the battlefield under an opponent's control · Lock
Show steps
  1. Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Orb of Dreams and triggers Intruder Alarm.
  2. Holding priority, activate Royal Assassin by tapping it, destroying the creature.
  3. Resolve the Intruder Alarm trigger, untapping all creatures.
  4. Repeat.
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