Grimgrin, Corpse-Born + Gravecrawler + Karametra's Favor

Grimgrin, Corpse-Born

Gravecrawler

Karametra's Favor

How it works

1. Activate Grimgrin by tapping it, adding .
2. Activate Grimgrin by sacrificing Gravecrawler, untapping Grimgrin and putting a +1/+1 counter on it.
3. Cast Gravecrawler from your graveyard by paying .
4. Repeat.

This cunning loop turns the graveyard into a perpetual engine by leveraging the relentless nature of Gravecrawler, which can be cast repeatedly from your graveyard as long as you control a Zombie. To fund this recursive casting, Karametra's Favor enchants Grimgrin, Corpse-Born, granting the legendary horror the ability to tap for mana. Grimgrin then uses that very black mana to sacrifice Gravecrawler, instantly untapping itself and growing larger with a +1/+1 counter in the process.