Vigor + Triskelion + Quest for Pure Flame

Vigor

Triskelion

Quest for Pure Flame

How it works

1. Activate Quest for Pure Flame by removing four quest counters from it and sacrificing it, doubling the amount of damage sources you control deal this turn.
2. Activate Triskelion by removing a +1/+1 counter from it, putting two +1/+1 counters on it due to Vigor.
3. Activate Triskelion by removing a +1/+1 counter from it, dealing 2 damage to any target.
4. Repeat from step 2 as desired.