Celes, Rune Knight + Crystalline Crawler + Gravecrawler + Umbral Collar Zealot

Celes, Rune Knight

Crystalline Crawler

Gravecrawler

Umbral Collar Zealot

How it works

1. Cast Gravecrawler from your graveyard by paying .
2. When Gravecrawler enters the battlefield, Celes's second ability triggers, putting a +1/+1 counter on each creature you control.
3. Activate Umbral Collar Zealot by sacrificing Gravecrawler.
4. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding .
5. Repeat.

This intricate loop transforms the lowly Gravecrawler into an engine of endless rebirth, fueled by the fact that you control a Zombie to repeatedly cast it from your graveyard for a single black mana. As it enters, Celes, Rune Knight triggers to grow your board with +1/+1 counters while providing filtering when she first arrives, and Umbral Collar Zealot stands ready to sacrifice the crawling horror to churn through your library with repeated surveil triggers. To keep the mana flowing, Crystalline Crawler converts those very counters into the black mana needed to recast the loop, while its own ability to absorb counters or trade them for mana sustains the whole operation indefinitely.