Kiki-Jiki, Mirror Breaker, and Sparring Mummy

Prerequisites

• Kiki-Jiki, Mirror Breaker on the battlefield
• Sparring Mummy on the battlefield

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Sparring Mummy with haste
2. When the Sparring Mummy token enters the battlefield, it triggers, untapping Kiki-Jiki
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB