Gravecrawler + Merrow Bonegnawer + Paradise Mantle + Altar of Dementia

Gravecrawler

Merrow Bonegnawer

Paradise Mantle

Altar of Dementia

How it works

1. Activate Merrow Bonegnawer by tapping it, adding .
2. Activate Altar of Dementia by sacrificing Gravecrawler, causing target player to mill cards equal to Gravecrawler's power.
3. Cast Gravecrawler by paying .
4. Merrow Bonegnawer triggers, untapping itself.
5. Repeat.

This loop turns a continuous cycle of life and death into an infinite milling machine by using the unique permissions of Gravecrawler, which can be repeatedly cast from your graveyard as long as you control a Zombie. To fund this recursive casting, Merrow Bonegnawer is equipped with Paradise Mantle to tap for mana, and its ability to untap whenever you cast a black spell keeps the mana flowing with each iteration. Finally, Altar of Dementia provides the sacrifice outlet that bins Gravecrawler in the first place while simultaneously turning every single loop into a chunk of milled cards for your opponent.