Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Deathbringer Thoctar + Tor Wauki the Younger

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Deathbringer Thoctar

Tor Wauki the Younger

How it works

1. Activate Anti-Venom using Deathbringer Thoctar'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 Tor Wauki the Younger.
2. Activate Anti-Venom using Deathbringer Thoctar's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
3. Repeat.

This potent loop turns Agatha's Soul Cauldron into a terrible engine by having it exile Deathbringer Thoctar, granting its activated ability to Anti-Venom, Horrifying Healer once Anti-Venom bears a +1/+1 counter. Anti-Venom's own replacement effect then steps in, converting the damage it would take into a net gain of +1/+1 counters rather than harm. Finally, Tor Wauki the Younger amplifies the damage dealt by that removed counter, allowing the sequence to feed into itself indefinitely and generate infinite damage.