Animation Module + Serra Redeemer + Phyrexian Altar

Animation Module

Serra Redeemer

Phyrexian Altar

How it works

1. Put 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, Serra Redeemer triggers, putting two +1/+1 counters on the Servo.
4. Animation Module triggers, holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
5. Resolve the Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
6. Repeat from step 3.

This loop is a masterclass in recursive manufacturing, relying entirely on the interplay between Animation Module, Serra Redeemer, and Phyrexian Altar to sustain itself. Once you kick things off by placing an initial counter, Animation Module invites you to pay mana whenever counters land on your permanents. Enter Serra Redeemer: its passive ability ensures that every time a small creature like the resulting 1/1 Servo enters the battlefield, it immediately receives two +1/+1 counters. That surge of counters retriggers Animation Module, and before that trigger even resolves, you can tap into Phyrexian Altar to sacrifice the Servo for the exact mana needed to pay for the module's creation cost. By cycling the Servo through the Altar for mana and right back into Serra Redeemer's buff, you generate an endless loop of creature tokens, sacrifices, and deaths.