Weatherlight is a mythic Legendary Artifact — Vehicle card from Dominaria Promos (PDOM), collector number 237s. Current market price: — (foil $7.95), 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