Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Primal Vigor + Deathbringer Thoctar

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Primal Vigor

Deathbringer Thoctar

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 Primal Vigor.
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 clever loop centers on Agatha's Soul Cauldron granting Deathbringer Thoctar's activated abilities to Anti-Venom, Horrifying Healer once it bears a +1/+1 counter. With Primal Vigor doubling every counter placed, Anti-Venom's damage prevention replacement effect turns self-inflicted damage into a net gain of counters. By pinging itself and harvesting the resulting growth, the altered Anti-Venom can repeatedly fuel its own abilities to deal infinite damage.