Sage of the Beyond is a rare Creature — Spirit Giant card from Kaldheim Commander (KHC), collector number 6. Current market price: $0.81, TCGplayer market prices via Scryfall.
Flying Spells you cast from anywhere other than your hand cost {2} less to cast. Foretell {4}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)