Thran Vigil, and Altar of Dementia

Prerequisites

• Thran Vigil on the battlefield
• Altar of Dementia on the battlefield
• The persist creature does not have a -1/-1 counter on it
• It is your turn

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. Thran Vigil triggers, putting a +1/+1 counter on the persist creature
4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the persist creature's power
5. Repeat

Results

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