Winry, Automail Mechanic

Winry, Automail Mechanic enters the battlefield
with X +1/+1 counters.
Artifact spells you cast cost {1} less to cast.
{t}, Remove a +1/+1 counter from Winry,
Automail Mechanic: Exile cards from the top of
your library until you exile an artifact. You may
play that artifact for as long as it's exiled. Put the
other exiled cards on the bottom of your library
in a random order.