Altar of Dementia + Crystalline Crawler + Gravecrawler + The Thirteenth Doctor

Mana needed: {B}

BGU identity

Commander legal

The 4 combo pieces

What must be in place

You control at least one additional Zombie.

How to execute it

  1. Activate Altar of Dementia by sacrificing Gravecrawler, causing target player to mill cards equal to Gravecrawler's power.
  2. Cast Gravecrawler from your graveyard by paying {B}.
  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 {B}.
  5. Repeat.

What the combo produces