Maskwood Nexus, Avatar of Woe, and Faces of the Past

Prerequisites

• Maskwood Nexus on the battlefield
• Avatar of Woe on the battlefield
• Faces of the Past on the battlefield
• Avatar of Woe does not have summoning sickness

Steps

1. Activate Avatar of Woe by tapping it, destroying target creature
2. When the creature dies, Faces of the Past triggers, untapping all creatures you control
3. Repeat as desired
4. You may repeat this loop whenever a creature enters the battlefield under an opponent's control

Results

• Destroy all creatures opponents control
• Destroy all creatures that enter the battlefield under an opponent's control