The Great Henge, and Altar of Dementia

Prerequisites

• The Great Henge on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the persist creature
2. The sacrificed creature's persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. The Great Henge triggers, putting a +1/+1 counter on the persist creature and causing you to draw a card
4. The -1/-1 and +1/+1 counters are removed as a state-based action
5. Resolve the ability from step 1
6. Repeat

Results

• Infinite self-mill
• Infinite card draw
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite mill
• Near-infinite death triggers
• Near-infinite sacrifice triggers