Lae'zel, Vlaakith's Champion, Druid's Call, Cathars' Crusade, and Triskelion

Prerequisites

• Lae'zel, Vlaakith's Champion on the battlefield
• Druid's Call on the battlefield
• Cathars' Crusade on the battlefield
• Triskelion on the battlefield
• Druid's Call attached to Triskelion
• Triskelion has at least three +1/+1 counters on it

Steps

1. Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to itself
2. Druid's Call triggers, creating a 1/1 Squirrel creature token
3. When the Squirrel enters the battlefield, Cathars' Crusade triggers, putting two +1/+1 counters on each creature you control
4. Repeat
5. During the next player's turn, you may remove all of the +1/+1 counters from Triskelion to deal infinite damage to any target(s)

Results

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