Altar of Dementia, and Good-Fortune Unicorn

Prerequisites

• Altar of Dementia on the battlefield
• Good-Fortune Unicorn on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters, Good-Fortune Unicorn triggers, putting a +1/+1 counter on the persist creature
4. Resolve the Altar of Dementia ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill