Marvin, Lazy Electrician

At the beginning of your upkeep, if you don't
control a creature named Percy, create Percy, a
legendary 1/1 white cat creature token with indestructible

Metalcraft - {t}: you get {e}. Activate only if you control three or more artifacts.

Whenever Percy or an Artifact creature you control attacks, you may pay {e}.
If you do, target creature gets a +1/+1 counter or a trample counter.