Animation Module + Securitron Squadron + Mana Echoes

Animation Module

Securitron Squadron

Mana Echoes

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, Securitron Squadron and Mana Echoes trigger.
4. Resolve the Mana Echoes trigger, adding C for each Servo you control.
5. Resolve the Securitron Squadron trigger, putting a +1/+1 counter on the Servo.
6. Repeat from step 2.

This clever loop turns the humble Servo artifact creature tokens into a self-sustaining engine of growth and mana. Securitron Squadron provides the crucial static ability that automatically outfits every entering token with a +1/+1 counter, which in turn feeds Animation Module's trigger to spawn another Servo for just one mana. As those new tokens flood the battlefield, Mana Echoes measures the growing army to generate more than enough colorless mana to sustain the loop indefinitely.