Xavier Sal, Infested Captain | Animation Module | Thornbite Staff

(and one other card)

Activate
Xavier Sal's second ability by tapping it and sacrificing a creature.
When the creature dies,
Xavier Sal triggers, untapping
Xavier Sal.
Resolve the
Xavier Sal ability from step 1, putting a +1/+1 counter on
Crystalline Crawler.
Animation Module triggers, holding priority, activate
Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding ({1} magic symbol) .
Resolve the
Animation Module trigger, causing you to pay ({1} magic symbol) to create a 1/1 Servo artifact creature token.
Repeat.
If you control another creature with a +1/+1 counter on it, you will get infinite +1/+1 counters among creatures you control, and you may instead use
Xavier Sal's first ability to get infinite copies of creature tokens you control.