Agatha's Soul Cauldron + Triskelion + Pest Mascot

Agatha's Soul Cauldron

Triskelion

Pest Mascot

How it works

1. Activate Pest Mascot by using Triskelion'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.

This loop relies on Agatha's Soul Cauldron to stitch together a deadly, self-sustaining engine by granting creatures with +1/+1 counters the activated abilities of any creature cards exiled within it. By exiling Triskelion, you gift those creatures the ability to remove a counter and deal 1 damage, which can target Pest Mascot itself. When Pest Mascot takes that damage—or rather, when its inherent properties and triggers are leveraged alongside the ping—you convert the damage into a life gain trigger that instantly replaces the spent counter, allowing you to repeat the cycle indefinitely for infinite damage and life.