Kiki-Jiki, Mirror Breaker, Altar of Dementia, and Phantom Steed

Prerequisites

• Kiki-Jiki, Mirror Breaker on the battlefield
• Altar of Dementia on the battlefield
• Phantom Steed on the battlefield

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Phantom Steed
2. When the Phantom Steed token enters the battlefield, it triggers, exiling Kiki-Jiki until Phantom Steed leaves the battlefield
3. Activate Altar of Dementia by sacrificing the Phantom Steed token
4. When the Phantom Steed token dies, Kiki-Jiki is returned from exile to the battlefield
5. Resolve the Altar of Dementia ability
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill