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

Yarus, Roar of the Old Gods

Ashcloud Phoenix

Altar of Dementia

How it works

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.