Extruder + Animation Module + Mana Echoes

Extruder

Animation Module

Mana Echoes

How it works

1. Activate Extruder by sacrificing another creature, putting a +1/+1 counter on a creature you control.
2. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
3. When the Servo enters the battlefield, Mana Echoes triggers, adding C for each Servo on the battlefield.
4. Repeat.
5. If there is at least one other Servo on the battlefield to start the combo and/or you have an additional 1 available, this combo nets infinite colorless mana.

This loop transforms the sacrifice outlet Extruder into an engine for endless growth by feeding counters directly into Animation Module. Every time you feed an artifact or creature to Extruder to place a +1/+1 counter, Animation Module triggers, letting you pay a single mana to spawn a fresh Servo artifact creature token. That new token immediately supercharges Mana Echoes, which taps into the shared creature types to yield a surplus of colorless mana. As the Servo count multiplies, Mana Echoes generates more than enough excess energy to fuel the Animation Module fee and sustain the entire loop indefinitely.