Activate Ashnod's Altar by sacrificing an additional creature, adding ({C} magic symbol) ({C} magic symbol) .
When the creature dies, Feral Ghoul's first ability triggers, putting a +1/+1 counter on it.
Animation Module triggers, causing you to pay ({1} magic symbol) to create a 1/1 Servo artifact creature token.
Repeat.
Once you have infinite +1/+1 counters on Feral Ghoul, you may sacrifice it to give opponents infinite rad counters, which will cause them to mill their library and lose a large amount of life during their next precombat main phase.