Mishra, Eminent One, Gonti's Aether Heart, and Elesh Norn, Mother of Machines

Prerequisites

• Mishra, Eminent One on the battlefield
• Gonti's Aether Heart on the battlefield
• Elesh Norn, Mother of Machines on the battlefield

Steps

1. At the beginning of your combat phase, Mishra triggers, creating a 4/4 artifact creature token copy of Gonti's Aether Heart named Mishra's Warform
2. When Mishra's Warform enters the battlefield, it and Gonti's Aether Heart trigger twice each, causing you to get eight energy counters
3. Activate Mishra's Warform by paying eight energy counters and exiling it, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns