Stoneforge Mystic is a mythic Creature — Kor Artificer card from Special Guests (SPG), collector number 29. Current market price: $40.36 (foil $84.20), TCGplayer market prices via Scryfall.
When this creature enters, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle. {1}{W}, {T}: You may put an Equipment card from your hand onto the battlefield.