Crawling Factory

When Crawling Factory enters the battlefield
create {x} 4/4 Colorless Golem Artifact Creature
Tokens and put one +1/+1 counter on each other artifact creature you control.
{t}: Add {c} to your mana pool and create a 4/4 Colorless Golem Artifact Creature Token with
"When this creature enters the battlefield pay {c} or sacrifice it at the beggining of your next
upkeep."