CommanderModernLegacyVintage
Result
Destroy each creature that enters the battlefield under an opponent's control, Lock
Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Urabrask and triggers Intruder Alarm.
Holding priority, activate Royal Assassin by tapping it, destroying the creature.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.
Component Cards
How It Works
1
Whenever a creature enters the battlefield under an opponent's control, it enters tapped due to Urabrask and triggers Intruder Alarm.
Holding priority, activate Royal Assassin by tapping it, destroying the creature.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.