Unruly Mob + Animation Module + Phyrexian Altar + Chatterfang, Squirrel General

Unruly Mob

Animation Module

Phyrexian Altar

Chatterfang, Squirrel General

How it works

1. Activate Phyrexian Altar by sacrificing a creature, adding 1.
2. Unruly Mob triggers, putting a +1/+1 counter on itself.
3. Animation Module triggers, costing you 1 to create a 1/1 Servo and a 1/1 Squirrel creature token.
4. Repeat.

This engine turns a humble sacrifice into a self-sustaining loop by feeding the mana back into the machinery at every step. When you sacrifice a creature to Phyrexian Altar, the resulting death trigger buffs Unruly Mob with a +1/+1 counter, which in turn sparks Animation Module's first ability so you can pay the exact mana you just generated to create a Servo token. Meanwhile, Chatterfang, Squirrel General's replacement effect doubles your token production by adding a bonus Squirrel alongside every Servo, netting you extra fodder. You can then immediately feed those newly created tokens back into Phyrexian Altar to repeat the process, generating infinite mana, infinite death triggers, and infinitely large creatures.