Prerequisites
- All permanents on the battlefield
- You control at least one additional Zombie
Steps
- Activate Phyrexian Altar by sacrificing Gravecrawler, adding
- Cast Gravecrawler from your graveyard by paying
- Desecrated Tomb trigger, creating a 1/1 Bat token
- Repeat
Results
Required Cards 3
Gravecrawler
Creature — Zombie