Requires

Tainted Observer must be on the battlefield. Animation Module must be on the battlefield. Crystalline Crawler must be on the battlefield. Hardened Scales must be on the battlefield. Tekuthal, Inquiry Dominus must be on the battlefield. Crystalline Crawler has at least one +1/+1 counter. 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 a 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 Tainted Observer, causing you to pay to put four +1/+1 counters on Crystalline Crawler.
4. Animation Module triggers four times.
5. Resolve the first three Animation Module triggers, choosing not to pay.
6. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding .
7. Resolve the final Animation Module trigger, causing you to pay to create a 1/1 Servo artifact creature token.
8. Repeat from step 3.

Results