Artificer's Assistant is a common Creature — Bird card from The List (PLST), collector number DOM-44. Current market price: $0.29, 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.)