So, what do you think about the dungeon runs? I ran 4 so far, and completed only the 1st one, because the Lich King carried me and I didn't find the busted enemies I would have encountered later. The other 3 runs have been interrupted by the Mothergloop (an ooze) and Xol the Unscathed (a female beholder).
The Mothergloop has
Smuggler's Run as hero power, and minions that summon a copy of themselves (buffs included) if they survive damage: the only way to win is to wipe the board before it gets too tough.
Xol runs the Warlock quest and her hero power makes her generate a special spell in her hand at the end of her turn, one of which is totally op because it gives control of a random enemy minion permanently for a few mana. So if the quest is completed, free board advantage is added to the free card advantage. I think the only way to survive would be to make her complete the quest by attacking
Howlfiend and also make her discard the quest prize on the same turn. Unfortunately I haven't managed to do that.