Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Furnace of Rath + Triskelion

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Furnace of Rath

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 Furnace of Rath.
2. Activate Anti-Venom using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
3. Repeat.

This intricate loop harnesses Agatha's Soul Cauldron to grant Triskelion the activated ability of Anti-Venom, Horrifying Healer, allowing it to target itself for self-inflicted damage. Because Furnace of Rath doubles that incoming damage, Anti-Venom's replacement effect prevents the hit and instead rewards the creature with a surplus of +1/+1 counters. By continuously removing counters to ping itself and generating more than it spends, the Triskelion engine grows infinitely large while unleashing boundless damage upon any target.