Visara the Dreadful, Intruder Alarm, and Overseer of the Damned

Prerequisites

• Visara the Dreadful on the battlefield
• Intruder Alarm on the battlefield
• Overseer of the Damned on the battlefield
• Visara does not have summoning sickness

Steps

1. Activate Visara by tapping it, destroying any nontoken creature
2. The creature dies, triggering Overseer of the Damned, creating a tapped 2/2 Zombie creature token
3. The Zombie enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Repeat
5. You may also repeat this loop any time a creature enters the battlefield under an opponent control

Results

• Destroy any nontoken creature that enters the battlefield under an opponent's control
• Destroy any number of target nontoken creature(s)