Agatha's Soul Cauldron + Triskelion + Butcher Ghoul

Agatha's Soul Cauldron

Triskelion

Butcher Ghoul

How it works

1. Activate Butcher Ghoul using Triskelion's ability by removing a +1/+1 counter from it.
2. Repeat step 1 until Butcher Ghoul has no +1/+1 counters on it.
3. Resolve all Butcher Ghoul abilities dealing 1 damage to Butcher Ghoul, and any remaining damage to any target(s).
4. Butcher Ghoul dies as a state-based action due to having 0 toughness.
5. Butcher Ghoul's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Repeat.

By feeding Butcher Ghoul into Agatha's Soul Cauldron, you grant it the lethal precision of Triskelion while weaponizing its own fragility in an endless loop. Each cycle has Butcher Ghoul shoot itself to strip away its counters, letting it gracefully expire to the graveyard only to bounce right back via undying. Agatha's Soul Cauldron ties the engine together by allowing you to spend mana freely and place those crucial +1/+1 counters back on your creatures, letting Triskelion's borrowed ability continuously clear the board or melt an opponent's life total.