Young Necromancer + Altar of Dementia

Young Necromancer

Altar of Dementia

How it works

1. Cast Young Necromancer by paying 4.
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.