Medomai the Ageless, Alesha, Who Smiles at Death, Sakashima the Impostor, and Bloodthrone Vampire

Prerequisites

• Medomai the Ageless on the battlefield
• Alesha, Who Smiles at Death on the battlefield
• Sakashima the Impostor in the graveyard
• Bloodthrone Vampire on the battlefield
• each turn available

Steps

1. Declare Alesha as an attacker
2. Alesha triggers, causing you to pay to return Sakashima the Impostor from your graveyard to the battlefield tapped and attacking as a nonlegendary copy of Medomai the Ageless
3. Deal combat damage using Sakashima the Impostor
4. Sakashima the Impostor triggers, causing you to take an extra turn after this one
5. Activate Bloodthrone Vampire by sacrificing Sakashima the Impostor Repeat each turn

Results

• Infinite turns
• Lock