I'm really excited to adapt my best decks for the standard format, especially considering that the game is likely to get closer to the vanilla level of board control where Flamestrike meant something.
Also, I really want to point out that they are not actually REMOVING Naxxramus from the game. They've said that you will still be able to buy the single player adventure mode for gold, just not real money.
Edit: Misread, you have to own at least one wing for that.
SpaceBoat's comments