Metalwork Colossus + The Ooze + Gorma, the Gullet + Arcbound Ravager

Metalwork Colossus

The Ooze

Gorma, the Gullet

Arcbound Ravager

How it works

1. Cast Metalwork Colossus by paying 0, which enters with at least two +1/+1 counters on it due to Gorma.
2. Activate Arcbound Ravager by sacrificing Metalwork Colossus.
3. When Metalwork Colossus dies, Gorma and The Ooze trigger.
4. Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter Metalwork Colossus had.
5. Resolve Gorma's trigger, putting a +1/+1 counter on it.
6. Resolve the Arcbound Ravager ability.
7. Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand.
8. Repeat.

This clever loop turns the immense artifact cost reduction of Metalwork Colossus into a perpetual engine by relying on Gorma, the Gullet to ensure it enters the battlefield with extra +1/+1 counters. When Arcbound Ravager sacrifices the Colossus, The Ooze converts those very counters into a flood of Mutagen tokens that can then be sacrificed to pay the Colossus's recursion ability. Because Gorma, the Gullet also tracks every death to empower subsequent iterations, this feedback loop generates an endless storm of artifact and creature triggers with terrifying efficiency.