Gravecrawler + Merrow Bonegnawer + Paradise Mantle + Carrion Feeder

Gravecrawler

Merrow Bonegnawer

Paradise Mantle

Carrion Feeder

How it works

1. Activate Merrow Bonegnawer by tapping it, adding .
2. Activate Carrion Feeder by sacrificing Gravecrawler, putting a +1/+1 counter on Carrion Feeder.
3. Cast Gravecrawler by paying .
4. Merrow Bonegnawer triggers, untapping itself.
5. Repeat.

This clever little loop turns the humble Gravecrawler into an endless sacrifice engine for Carrion Feeder, pumping your zombie horde while stacking up infinite death triggers and a massive storm count. To make the cycle self-sustaining, Paradise Mantle equips to Merrow Bonegnawer, allowing the Merrow to tap for the exact black mana needed to recast Gravecrawler from the graveyard. Every time you cast that black spell, Merrow Bonegnawer's static trigger untaps it so you can tap it for mana again, keeping the gears turning indefinitely.