Ghave, Guru of Spores, Cathars' Crusade, and Crystalline Crawler

Prerequisites

• Ghave, Guru of Spores on the battlefield
• Cathars' Crusade on the battlefield
• Crystalline Crawler on the battlefield
• Ghave has at least two +1/+1 counters on it
• available

Steps

1. Activate Ghave's first ability by paying and removing a +1/+1 counter from it, creating a 1/1 Saproling creature token
2. The Saproling enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
3. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite +1/+1 counters