Emmie, The Gear Crafter

At the beginning of your upkeep sacrifice X scrap tokens and then choose one:
-Create X 1/1 thopter artifact creature tokens with flying.
-Create a 0/0 construct artifact creature token with trample, put X +1/+1 counters on it.
At the beginning of your endstep sacrifice a nontoken artifact, create scrap artifact tokens equal to the mana value.