The Thirteenth Doctor, Crystalline Crawler, Gravecrawler, and Carrion Feeder

Prerequisites

• The Thirteenth Doctor on the battlefield
• Crystalline Crawler on the battlefield
• Gravecrawler on the battlefield
• Carrion Feeder on the battlefield
• available

Steps

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

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count