Gravecrawler + Merrow Bonegnawer + Paradise Mantle + Viscera Seer

Gravecrawler

Merrow Bonegnawer

Paradise Mantle

Viscera Seer

How it works

1. Activate Merrow Bonegnawer by tapping it, adding .
2. Activate Viscera Seer by sacrificing Gravecrawler, causing you to scry 1.
3. Cast Gravecrawler by paying .
4. Merrow Bonegnawer triggers, untapping itself.
5. Repeat.

This loop transforms a tiny skeleton into a self-sustaining engine by turning every iteration into a free spell cast. With Paradise Mantle equipped to Merrow Bonegnawer, it functions as a mana dork that generates the black mana required to recast Gravecrawler from the graveyard, fueled directly by its status as a Zombie. As Gravecrawler enters and is promptly sacrificed to Viscera Seer for a scry, casting the black spell triggers Merrow Bonegnawer to untap, ready to tap for mana again and repeat the entire cycle.