Cathars' Crusade + Animation Module + Crystalline Crawler

Cathars' Crusade

Animation Module

Crystalline Crawler

How it works

1. Activate Crystalline Crawler's second ability by tapping it, putting a +1/+1 counter on itself.
2. Animation Module triggers, holding priority, activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding 1.
3. Resolve the Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. The Servo enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
5. Animation Module triggers once for each creature you control.
6. Resolve all but one Animation Module trigger, choosing not to pay.
7. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding 1.
8. Repeat from step 3.