Spirit Mirror, Amoeboid Changeling, and Faces of the Past

Prerequisites

• Spirit Mirror on the battlefield
• Amoeboid Changeling on the battlefield
• Faces of the Past on the battlefield

Steps

1. Activate Amoeboid Changeling's first ability by tapping it, causing any creature an opponent controls to gain all creature types until end of turn
2. Activate Spirit Mirror by paying , destroying the opponent's creature
3. When the creature dies, Faces of the Past triggers, untapping Amoeboid Changeling
4. Repeat

Results

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