guren, wandering artificer

{t}, exile this creature, sacrifice an artifact: reveal
cards from the top of your library until you
reveal an artifact card, then put that card onto
the battlefield. use this ability only at a time
when you could cast sorceries. return this
creature from exile at your next upkeep step.
{0}, choose an artifact card in your hand and put
that card into your library: add {1} to your mana
pool and then shuffle your library.