Hearthpwn

Quote from Buuwelka »

Finally the last one has to be Nefarian, and seems to be a 9 mana card that has a human and a dragon form.

In the old Naxxramas trailer you also see a Kel'Thuzad which were actually the pcitrue of the boss fight and not from the card which you were rewarded. I think (but of course I don't know) that this is the same with Nefarian. Probably he will switch his forms during the final boss fight like Kel'Thuzad changed his hero ability. That would mean that we have no idea how the actuall Nefarian card would look like and if this card can still change forms or not.