Medomai the Ageless, and Phantom Steed

Prerequisites

• Medomai the Ageless in exile
• Phantom Steed on the battlefield
• Phantom Steed does not have summoning sickness
• An opponent is unable to block and kill your creatures

Steps

1. Declare Phantom Steed as an attacker
2. Phantom Steed triggers, creating a token copy of Medomai that is tapped and attacking
3. Deal combat damage with the Medomai token, causing you to take an extra turn after this one
4. Repeat each turn

Results

• Infinite turns