Agatha's Soul Cauldron + Deathbringer Thoctar + Pest Mascot

Agatha's Soul Cauldron

Deathbringer Thoctar

Pest Mascot

How it works

1. Activate Pest Mascot by using Deathbringer Thoctar's ability by removing a +1/+1 counter from it, dealing 1 damage to any target and causing you to gain 1 life due to its lifelink.
2. Pest Mascot triggers, putting a +1/+1 counter on it.
3. Repeat.

By utilizing Agatha's Soul Cauldron to exile Deathbringer Thoctar, your creatures with +1/+1 counters gain its dangerous ability to spend a counter and deal 1 damage. With Pest Mascot exiled or on the board—and crucially equipped with its inherent lifelink—each ping of damage gains you life, which in turn triggers Pest Mascot to replace the spent counter. This creates a self-sustaining loop that turns simple arithmetic into infinite damage and infinite life.