Arcanis, Spellweaver Savant

When Arcanis, Spellweaver Savant enters, you may
cast an instant or sorcery spell from your hand
without paying its mana cost.

Whenever you cast an instant or sorcery spell, you
may draw a card. If you do, discard a card.

{u}{r}: Return Arcanis, Spellweaver Savant to its
owner's hand.