Self-Operating Factory

At the beginning of your upkeep, tap Self-
Operating Factory, then choose one at random:
Create 3 1/1 colorless Servo artifact creature
tokens.
Create 2 1/1 colorless Thopter artifact creature
tokens with flying.
Create a 3/3 colorless Construct artifact creature
token.
At the beginning of your end step, if you control
6 or more artifacts, sacrifice 5 artifacts. If you do, transform this card.