Smythe, Slayer-Maker

Pay the mana cost of target artifact creature in
your hand minus {2}, {t}: Put that artifact
creature to the battlefield with a slayer counter.
An artifact with one or more slayer counters
is an artifact instead of its other types and is a
Vehicle and gains Crew 2.
Remove a slayer counter from an artifact, {4}:
Draw a card, then discard a card.