Requires

Animation Module must be on the battlefield. Cathars' Crusade must be on the battlefield. Mana Echoes must be on the battlefield. You have a way to put a +1/+1 counter on a creature you control. Mana needed:

Steps

1. Put a +1/+1 counter on any creature you control.
2. Animation Module triggers, causing you to pay to create a 1/1 Servo artifact creature token.
3. The Servo enters the battlefield, triggering Mana Echoes and Cathars' Crusade.
4. Resolve the Mana Echoes trigger, adding at least .
5. Resolve the Cathars' Crusade trigger, putting a +1/+1 on each creature you control.
6. Animation Module triggers for each +1/+1 counter placed this way.
7. Resolve all but one Animation Module trigger, choosing not to pay.
8. Resolve the final Animation Module trigger, causing you to pay to create a 1/1 Servo artifact creature token.
9. Repeat from step 3.

Results