Is Sage of the Beyond legal in Standard, Modern, and Commander?

Sage of the Beyond is legal in: Legacy, Vintage, Commander.

What type of card is Sage of the Beyond?

Sage of the Beyond is a Creature — Spirit Giant. Its oracle text reads: "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.)"