Oathbreaker's Spark

: If this is your commander, exile an instant or sorcery card from your deck before the game begins. This card's color identity = the exiled card.
-1: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell.
-3: Create a copy of the card exiled with Oathbreaker's Spark. You may cast the copy until your next turn.