Gonti's Aether Heart, Mishra, Eminent One, and The Underworld Cookbook

Prerequisites

• Gonti's Aether Heart on the battlefield
• Mishra, Eminent One on the battlefield
• The Underworld Cookbook on the battlefield
• An additional card in hand

Steps

1. At the beginning of combat, Mishra triggers, creating a 4/4 artifact creature token copy of Gonti's Aether Heart named Mishra's Warform
2. Mishra's Warform enters the battlefield, triggering itself and Gonti's Aether Heart, causing you to get four energy counters
3. Activate The Underworld Cookbook by tapping it and discarding a card, creating a Food artifact token
4. The Food token enters the battlefield, triggering Mishra's Warform and Gonti's Aether Heart, causing you to get four energy counters
5. Activate Mishra's Warform by paying eight energy counters and exiling it, taking an extra turn after this one
6. Repeat each turn

Results

• Infinite turns