Kiki-Jiki, Mirror Breaker, Cacophodon, and Terror of the Peaks

Prerequisites

• Kiki-Jiki, Mirror Breaker on the battlefield
• Cacophodon on the battlefield
• Terror of the Peaks on the battlefield

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Cacophodon with haste
2. The Cacophodon token enters the battlefield, triggering Terror of the Peaks, dealing damage to the Cacophodon token equal to its power
3. The Cacophodon token triggers, untapping Kiki-Jiki
4. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB