Young Necromancer, and Altar of Dementia

Prerequisites

• Young Necromancer in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Young Necromancer by paying
2. Young Necromancer enters the battlefield, triggering its ability
3. Holding priority, activate Altar of Dementia by sacrificing Young Necromancer, causing you to mill two cards
4. Resolve the Young Necromancer trigger, exiling two cards from your graveyard except Young Necromancer, and returning Young Necromancer from your graveyard to the battlefield
5. Repeat from step 2

Results

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