Medomai the Ageless, Alesha, Who Smiles at Death, Spark Double, and Altar of Dementia

Prerequisites

• Medomai the Ageless on the battlefield
• Alesha, Who Smiles at Death on the battlefield
• Spark Double in the graveyard
• Altar of Dementia on the battlefield
• An opponent cannot block creatures you control
• Alesha does not have summoning sickness
• each turn available

Steps

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

Results

• Infinite turns