Witch-Maw Nephilim + Animation Module + Pitiless Plunderer + Clockspinning + Ashnod's Altar

Witch-Maw Nephilim

Animation Module

Pitiless Plunderer

Clockspinning

Ashnod's Altar

How it works

1. Cast Clockspinning with buyback by paying 3, targeting Witch-Maw Nephilim.
2. Witch-Maw Nephilim's first ability triggers, putting two +1/+1 counters on it.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. Activate Ashnod's Altar by sacrificing the Servo, adding CC.
5. When the Servo dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
6. Resolve Clockspinning, putting a +1/+1 counter on Witch-Maw Nephilim and returning Clockspinning to your hand.
7. Repeat steps 3 through 5 one additional time.
8. Activate the Treasures by tapping and sacrificing them, adding 1.
9. Repeat.
10. You may also target any other creature you control that has a +1/+1 counter on it using Clockspinning.

This clever loop centers on casting Clockspinning with buyback, whose resolution and casting triggers combine to rapidly escalate power. Each cast triggers Witch-Maw Nephilim to grow larger while also feeding Animation Module to manufacture a fresh Servo token. You then feed that Servo to Ashnod's Altar to generate the colorless mana needed to sustain the loop, while Pitiless Plunderer steps in to turn that sacrifice into a Treasure token. The treasures and altar together yield the exact mana required to recast Clockspinning, letting you endlessly repeat the cycle to grow your creatures infinitely and trigger a cascade of deaths and artifact creation.