Yarus, Roar of the Old Gods, Ashcloud Phoenix, and Altar of Dementia

Prerequisites

• Yarus, Roar of the Old Gods on the battlefield
• Ashcloud Phoenix on the battlefield
• Altar of Dementia on the battlefield
• Your life total is at least 2 greater than the largest life total among your opponents

Steps

1. Activate Altar of Dementia by sacrificing Ashcloud Phoenix
2. When Ashcloud Phoenix dies, its first ability triggers, returning it from your graveyard to the battlefield face-down
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Ashcloud Phoenix's power
4. Activate Altar of Dementia by sacrificing Ashcloud Phoenix
5. Yarus' second ability triggers, returning Ashcloud Phoenix from your graveyard to the battlefield face down, and then turning it face up
6. Ashcloud Phoenix's second ability triggers, dealing 2 damage to each player
7. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Ashcloud Phoenix's power
8. Repeat

Results

• Near-infinite damage to all players
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite mill
• Near-infinite sacrifice triggers
• Near-infinite self-mill