Stoneforge Acolyte is a uncommon Creature — Kor Artificer Ally card from Oath of the Gatewatch (OGW), collector number 38. Current market price: $0.13 (foil $0.61), TCGplayer market prices via Scryfall.
Cohort — {T}, Tap an untapped Ally you control: Look at the top four cards of your library. You may reveal an Equipment card from among them and put it into your hand. Put the rest on the bottom of your library in any order.