Murderous Redcap, Good-Fortune Unicorn, and Altar of Dementia

Prerequisites

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

Steps

1. Sacrifice Murderous Redcap to Altar of Dementia to mill target player 2
2. Murderous Redcap's persist triggers, returning it to the battlefield
3. Murderous Redcap returns to the battlefield with a +1/+1 counter and a -1/-1 counter which cancel out
4. Murderous Redcap triggers, dealing 2 damage to any target
5. Repeat

Results

• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers