The Thirteenth Doctor + Crystalline Crawler + Gravecrawler + Carrion Feeder

The Thirteenth Doctor

Crystalline Crawler

Gravecrawler

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Gravecrawler, putting a +1/+1 counter on Carrion Feeder.
2. Cast Gravecrawler from your graveyard by paying .
3. The Thirteenth Doctor's first ability triggers, putting a +1/+1 counter on Crystalline Crawler.
4. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding .
5. Repeat.

This clever loop transforms graveyard recursion into an engine of perpetual growth by using Gravecrawler as the ultimate sacrifice fodder for Carrion Feeder. Every time you recast Gravecrawler from the graveyard, The Thirteenth Doctor’s Paradox ability triggers to place a fresh +1/+1 counter on Crystalline Crawler. That counter is then immediately stripped away to pay for Crystalline Crawler's mana ability, generating the black mana needed to cast Gravecrawler all over again.