Vigor + Triskelion + Vorinclex, Monstrous Raider

Vigor

Triskelion

Vorinclex, Monstrous Raider

How it works

1. Activate Triskelion by removing a +1/+1 counter on it, targeting itself, but putting two +1/+1 counters on it due to Vigor.
2. Activate Triskelion by removing a +1/+1 counter on it, dealing 1 damage to any target.
3. Repeat.

This clever loop transforms Triskelion into an infinite artillery piece by turning its self-inflicted damage into a net gain of counters. When Triskelion pings itself, Vigor steps in to prevent that damage and replaces it with +1/+1 counters equal to the damage dealt. To supercharge the process, Vorinclex, Monstrous Raider doubles any counters you would place, ensuring that Vigor's replacement effect yields twice as many counters as needed to keep the cycle going. This leaves you with an infinitely large Triskelion and as many extra +1/+1 counters as you want to spread across your creatures, ready to blast away any remaining targets.