Amoeboid Changeling, Spirit Mirror, and Thornbite Staff

Prerequisites

• Amoeboid Changeling on the battlefield
• Spirit Mirror on the battlefield
• Thornbite Staff on the battlefield
• Thornbite Staff attached to Amoeboid Changeling
• Amoeboid Changeling does not have summoning sickness

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. The creature dies, triggering Amoeboid Changeling, untapping Amoeboid Changeling
4. Repeat
5. You may also 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