Buyback on a stolen card
Buyback {X} (You may pay an additional {X} as you cast this spell. If you do, put this card into your hand as it resolves.)
If I buyback a card I've stolen, could I put a card I don't own into my hand? Or is there a CR note that states the owner of the card gets the buyback? I know it's not exactly the most common keyword but putting together a theft deck and wondering how that works.