I've never played Hearthstone, so I don't understand how these cards can be used in a game. I read about Hearthstone a bit, and apparently it's a competitive game for two which can be played online. I'm not into this sort of stuff, and I'm quite far from Warcraft, but I'm glad that you've made these cards as a modification of the original game because this kind of stuff is good for Bitcoin promotion.
So how does this work? Are they publicly available on some website where people can choose to play with this set of cards? If not, have you considered making it so, and is it even possible?