Cathars' Crusade, Mana Echoes, and Triskelavus

Prerequisites

• Cathars' Crusade on the battlefield
• Mana Echoes on the battlefield
• Triskelavus on the battlefield
• Triskelavus has at least one +1/+1 counter on it
• available

Steps

1. Activate Triskelavus by paying and removing a +1/+1 counter from it, creating a 1/1 Triskelavite artifact creature token
2. The Triskelavite enters the battlefield, triggering Mana Echoes and Cathars' Crusade
3. Resolve the Mana Echoes trigger, adding for each Triskelavite you control
4. Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control
5. Repeat
6. Once you have infinite Triskelavite tokens, you may sacrifice them to deal infinite damage to any target(s)

Results

• Infinite +1/+1 counters on all creatures you control except Triskelavus
• Infinite colorless mana
• Infinite creature tokens
• Infinite damage
• Infinite ETB