Animation Module + Light of Promise + Essence Warden + Phyrexian Altar

Animation Module

Light of Promise

Essence Warden

Phyrexian Altar

How it works

1. Gain life.
2. The creature with Light of Promise attached triggers, putting a +1/+1 counter on it.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. When the Servo enters, Essence Warden triggers, causing you to gain life.
5. The creature with Light of Promise attached triggers. Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
6. Resolve the trigger from the creature with Light of Promise attached, putting a +1/+1 counter on it
7. Repeat from step 3.

This clever loop starts the moment you gain life, which makes Light of Promise trigger to grow your enchanted creature and simultaneously fires off Animation Module's first ability. By paying the single mana demanded by Animation Module, you pop out a fresh Servo token that immediately brings Essence Warden online to pad your life total and restart the chain. To keep the mana flowing, you can feed that very same token to Phyrexian Altar to generate the exact {1} needed to pay for Animation Module's creation cost each iteration. The result is a self-sustaining engine that pumps out endless death and sacrifice triggers while stacking infinitely large +1/+1 counters onto your creatures.