Frozen Aether + Intruder Alarm + Royal Assassin

UB identity

Commander legal

The 3 combo pieces

• Frozen Aether
• Intruder Alarm
• Royal Assassin

What must be in place

Royal Assassin does not have summoning sickness.

How to execute it

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.

What the combo produces

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