Until the next set comes out then your cards are worthless.Hasbro is treating you bums like kings and queens and you don't even know it. For just ten bucks you can get some commons and uncommons from a core set to make a free deck and play casually online with it FOREVER!
And it's not like the random junk I pick from drafts will ever mesh together into something good enough to play with in constructed. It really is just a one-time fun fest and then the cards just languish in my inventory.