Golos, Tireless Pilgrim is a rare Legendary Artifact Creature — Scout card from Core Set 2020 Promos (PM20), collector number 226p. Current market price: $4.60 (foil $9.34), TCGplayer market prices via Scryfall.
When Golos enters, you may search your library for a land card, put that card onto the battlefield tapped, then shuffle. {2}{W}{U}{B}{R}{G}: Exile the top three cards of your library. You may play them this turn without paying their mana costs.