Blade of the Bloodchief attached to any creature you control.
You control at least one additional artifact.
Steps
Activate Krark-Clan Ironworks by sacrificing any other artifact you control, adding ({C} magic symbol) ({C} magic symbol) .
Blade of the Bloodchief triggers, putting a +1/+1 counter on the creature it is attached to.
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 the creature with Blade of the Bloodchief attached, you may activate Blade of the Bloodchief's equip ability, attaching it to another creature you control.
If you do, you may repeat step 5 for each creature you control.