Animation Module + Skyknight Squire + Mana Echoes

Animation Module

Skyknight Squire

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

This clever loop starts turning when you introduce a +1/+1 counter to kick Animation Module into gear, letting you pay {1} to spawn a 1/1 Servo artifact creature token. That new creature's entrance immediately rouses Skyknight Squire to collect a fresh +1/+1 counter, which in turn triggers Animation Module all over again to keep the Servo factory running. Meanwhile, Mana Echoes watches your growing army enter the battlefield, outputting a surging wave of colorless mana with every iteration to comfortably fund the module's endless fee.