Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Lae'zel, Vlaakith's Champion + Deathbringer Thoctar

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Lae'zel, Vlaakith's Champion

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 Lae'zel.
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 intricate setup transforms Anti-Venom, Horrifying Healer into a lethal engine by feeding its damage-prevention text into Agatha's Soul Cauldron. With the Cauldron exiling Deathbringer Thoctar to grant its activated abilities to your creatures, Lae'zel, Vlaakith's Champion steps in to amplify counter generation, ensuring that every time Anti-Venom's ability removes a counter and attempts to deal 1 damage to itself, Lae'zel's replacement effect grants more counters than are spent. This generates an unstoppable loop of growing +1/+1 counters and infinite damage to any target.