Shork, Bureau's Bio-Conjurer

Partner with Crown, Steel-Leaf Defender
Whenever an artifact creature you control
attacks, gain {e}.
Pay X amount of {e}: Put X +1/+1 counters on
target artifact, it becomes an artifact creature
with base power and toughness 0/0. X can't be 0.
{g}{u}, {t}: Tap up to 3 target creatures with
power 3 or less.