Spirit Mirror, Artificial Evolution, and Kudo, King Among Bears

Prerequisites

• Spirit Mirror on the battlefield
• Artificial Evolution in hand
• Kudo, King Among Bears on the battlefield
• available

Steps

1. Cast Artificial Evolution by paying , changing all instances of "Reflection" on Spirit Mirror to "Bear"
2. Activate Spirit Mirror by paying , destroying target creature as it is a Bear due to Kudo
3. Repeat step 2 as desired
4. You may repeat step 2 whenever a creature enters the battlefield under an opponent's control

Results

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