Kotis, Sibsig Champion, Altar of Dementia, and Warden of the Eye

Prerequisites

• Kotis, Sibsig Champion on the battlefield
• Altar of Dementia on the battlefield
• Warden of the Eye on the battlefield
• undefined

Steps

1. Cast the extra turn spell by paying its mana cost, causing you to take an extra turn after this one
2. Move to your extra turn
3. Activate Altar of Dementia by sacrificing Warden of the Eye, causing you to mill cards equal to Warden of the Eye's power
4. Cast Warden of the Eye from your graveyard by paying its mana cost and exiling three other cards from your graveyard, ensuring not to exile the extra turn spell
5. When Warden of the Eye enters the battlefield, it triggers, returning the extra turn spell from your graveyard to your hand
6. Repeat

Results

• Near-infinite turns