Bot Factory

Bot Factory enters the battlefield tapped
{1}{t}: Create a 1/1 construct artifact creature token.
{2}{t}: Create a 2/1 thopter artifact creature token
with Flying.
{4}{t}: Create a 3/4 construct artifact creature token
with Stun 1. (When this creature deals damage to a creature, tap it. It doesn't untap during it's owner's next untap step.)