You get a free Premium Booster on Xbox 360 if you purchased Magic 2014. Someone should upload a save with that free booster unopened to see if it's modable.
Wish I would've thought of that earlier... I'm not impressed with some of the best cards being only in premium booster packs though, it takes long enough as it is to get everything unlocked, now they are adding stuff that you can't get unless you pay for it. Kind of nice though building your own deck, only played a few stages into the campaign, kind of getting my ass kicked though, lol.