Rite of Passage + Triskelion + Estrid's Invocation

Rite of Passage

Triskelion

Estrid's Invocation

How it works

1. Remove a +1/+1 counter from Triskelion to deal 1 damage to Triskelion.
2. The Rite of Passages trigger, putting 2 +1/+1 counters on Triskelion.
3. Repeat for infinite +1/+1 counters.
4. End the turn, removing all damage marked on Triskelion.
5. Remove infinite counters from Triskelion to deal infinite damage.