Captain America, Team Leader + Animation Module + Phyrexian Altar + Leyline of Transformation

Captain America, Team Leader

Animation Module

Phyrexian Altar

Leyline of Transformation

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 as a Hero due to Leyline of Transformation, Captain America triggers, putting a +1/+1 counter on it and the Servo.
4. Animation Module triggers twice.
5. Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
6. Resolve the first Animation Module trigger, choosing not to pay.
7. Resolve the second Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
8. Repeat from step 3.

This clever loop turns standard +1/+1 counter triggers into a self-sustaining manufacturing line, fueled by Leyline of Transformation turning every creature you control into a Hero. Thanks to that type-shifting enchantment, every token generated by Animation Module makes Captain America, Team Leader proud by entering as a Hero, which triggers the Captain to drop a counter on both itself and the newcomer. That counter placement feeds right back into Animation Module to make another token, while Phyrexian Altar stands ready to sacrifice those newly minted Servos into the mana required to keep the loop spinning endlessly.