Weatherlight is a mythic Legendary Artifact — Vehicle card from Dominaria (DOM), collector number 237. Current market price: $1.40 (foil $7.89), TCGplayer market prices via Scryfall.
Flying Whenever Weatherlight deals combat damage to a player, look at the top five cards of your library. You may reveal a historic card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. (Artifacts, legendaries, and Sagas are historic.) Crew 3