Animation Module + Cleric Class + Soul Warden + Phyrexian Altar

Animation Module

Cleric Class

Soul Warden

Phyrexian Altar

How it works

1. Gain life.
2. Cleric Class triggers, putting a +1/+1 counter on a creature you control.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. When the Servo enters, Soul Warden triggers, causing you to gain life.
5. Cleric Class triggers. Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
6. Resolve the Cleric Class trigger, putting a +1/+1 counter on a creature you control.
7. Repeat from step 3.

This brilliant loop turns a single instance of lifegain into a self-sustaining engine of growth and sacrifice. With Cleric Class active at level 2 or higher, any life gained triggers a +1/+1 counter placement, which Animation Module eagerly rewards by offering a Servo token for the low cost of {1}. Soul Warden steps in to catch each new arrival by feeding you fresh life whenever that Servo enters the battlefield, which naturally loops the entire process back to Cleric Class. To keep the mana flowing, Phyrexian Altar lets you sacrifice your freshly minted Servo to generate the exact {1} needed to pay Animation Module's trigger, creating an airtight loop of infinite lifegain, enter-the-battlefield triggers, and ever-growing creatures.