Rath, Ingenious Flamecaller

Eminence - As long as Rath, Ingenious Flamecaller is in the command zone or on the battlefield, whenever you cast an instant or sorcery spell, you may pay {x} where {x} is that spell's converted mana cost. If you do, copy that spell and have target opponent gain control of it, then you may draw a card.
Instant and Sorcery spells you cast cost {2} less.