Medomai the Ageless, Identity Thief, and Felhide Spiritbinder

Prerequisites

• Medomai the Ageless on the battlefield
• Identity Thief on the battlefield
• Felhide Spiritbinder on the battlefield
• Medomai the Ageless and Felhide Spiritbinder do not have summoning sickness
• An opponent cannot block and kill Felhide Spiritbinder
• An opponent cannot block Medomai the Ageless
• each turn available

Steps

1. Declare Medomai the Ageless and Felhide Spiritbinder as attackers
2. When Medomai the Ageless deals combat damage to a player, it triggers, causing you to take an extra turn after this one
3. When Felhide Spiritbinder untaps in your next extra turn's untap step, it triggers, allowing you to pay to create a token copy of Identity Thief with haste
4. Declare the Identity Thief token and Felhide Spiritbinder as attackers
5. The Identity Thief token triggers, exiling Medomai the Ageless, becoming a copy of Medomai the Ageless until end of turn, and creating a delayed triggered ability
6. When the Identity Thief token deals combat damage to a player, it triggers, causing you to take an extra turn after this one
7. At the beginning of your end step, the delayed triggered ability from step 5 triggers, returning Medomai the Ageless from exile to the battlefield
8. Let the Identity Thief token die to the legend rule
9. Repeat from step 3 each turn

Results

• Infinite turns