Castanova
Prophet
It's interesting, because some classes (Warlock for example) have far better hero abilities than other classes. So they give them crappier cards to compensate. But with neutral cards available, it seems like a small drawback in the long run.
I have my suspicions that this game will be vastly more difficult to balance than anything they've done before, including Starcraft/War3/WoW/etc. Especially since they need to support two opposite game modes: constructed and arena. On the flip side of the coin, I doubt very many people will care.