Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Kami of Whispered Hopes + Triskelion

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Kami of Whispered Hopes

Triskelion

How it works

1. Activate Anti-Venom using Triskelion's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and Kami of Whispered Hopes.
2. Activate Anti-Venom using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
3. Repeat.