Binarian Mage

When Binarian Mage enters the battlefield, exile the
top card of your library. If it's an instant, sorcery, or Digital-Form creature spell, you may choose to cast
it for {2} less.

{3}, {t}: Choose target opposing creature, deal X
damage to it, where X is the amount of your cards
that are exiled. Activate only as a sorcery.

Sorceries casted from your hand cost {1} less.