Druid's Call, Cathars' Crusade, Triskelion, and Doubling Season

Prerequisites

• Druid's Call on the battlefield
• Cathars' Crusade on the battlefield
• Triskelion on the battlefield
• Doubling Season on the battlefield

Steps

1. Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to itself
2. Druid's Call triggers, creating two 1/1 Squirrel creature tokens
3. When the Squirrels enters the battlefield, Cathars' Crusade triggers twice, putting four +1/+1 counters on each creature you control
4. Repeat
5. Once you have infinite +1/+1 counters on Triskelion, you may remove them to deal infinite damage to any target(s)

Results

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