Mythos of Brokkos is a rare Sorcery card from Ikoria: Lair of Behemoths (IKO), collector number 168. Current market price: $0.29 (foil $0.42), TCGplayer market prices via Scryfall.
If {U}{B} was spent to cast this spell, search your library for a card, put that card into your graveyard, then shuffle. Return up to two permanent cards from your graveyard to your hand.