Artificer's Assistant is a common Creature — Bird card from Dominaria (DOM), collector number 44. Current market price: $0.25 (foil $1.47), TCGplayer market prices via Scryfall.
Flying Whenever you cast a historic spell, scry 1. (Artifacts, legendaries, and Sagas are historic. To scry 1, look at the top card of your library, then you may put that card on the bottom.)