Medomai the Ageless, Exchange of Words, and Mistmeadow Vanisher

Prerequisites

• Medomai the Ageless on the battlefield
• Exchange of Words in hand
• Mistmeadow Vanisher on the battlefield
• An opponent cannot block Medomai
• the first turn available

Steps

1. Cast Exchange of Words by paying
2. When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of Medomai and Mistmeadow Vanisher until Exchange of Words leaves the battlefield
3. Declare Medomai as an attacker
4. Medomai triggers, exiling Exchange of Words until your end step
5. When Exchange of Words leaves the battlefield, Medomai and Mistmeadow Vanisher retain their original textboxes
6. Deal combat damage using Medomai
7. Medomai triggers, causing you to take an extra turn after this one
8. At the beginning of your end step, Medomai triggers, returning Exchange of Words to the battlefield from exile
9. When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of Medomai and Mistmeadow Vanisher until Exchange of Words leaves the battlefield
10. Repeat from step 3 each turn

Results

• Infinite turns