The Thirteenth Doctor, Crystalline Crawler, Gravecrawler, and Ashnod's Altar

Prerequisites

• The Thirteenth Doctor on the battlefield
• Crystalline Crawler on the battlefield
• Gravecrawler on the battlefield
• Ashnod's Altar on the battlefield
• You control at least one additional Zombie
• available

Steps

1. Activate Ashnod's Altar by sacrificing Gravecrawler, adding
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

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count