VERY slow, even for handbuff DK. Wouldnt be surprised to see this buffed to 4 mana eventually.

High contender for cutest art in the expac, but its a style of Frost DK that hasnt been seen before.

Neat handbuff payoff, could be strong but its pretty slow.

VERY strong board clear card, situationally better than Defile even.

Clearly for handbuff DK, but we have yet to see that archetype take off.

Very fun meme concepts from this guy, but competitive viability seems lacking.

Tough to say, but a pseudo removal might be good for a variety of DH decks.

Very fun card, but its too slow and the OG DH cards just aren't that strong anymore

Very good for Big DH, and might be good enough for other slow DH decks. Some demons get pretty nasty with a discount.

Another powerful stabilizing tool for DH, not much else to say.

DH doesn't really get card generation, so its tough to say how good this will be. Maybe the more limited demon pool will make it alright,.

Slots well into Big Demons DH, but it remains to be seen if that will be good.

Pretty slow without Multistrike, I don't think this gets played.

Better than I think some people give it credit for. +2 attack immediately and potentially later is nice.

I think this is a pretty good stabilization card. Definitely sees play in slower DH decks.

Glad Druid is losing ramp, but I loathe the inevitable OTK that will come from this.

Corpse Conjurer weaves DK into Scholomance and functions as an alternate method of generating corpses that does not require huge numbers of minions. Grim Harvest functions as a powerful early board control tool, much like Plague Strike, but also requires you to have a pre-established board to get full value.

Missed the early feedback train, but I will endeavor to get some feedback in on my elusive day off.

Two initial ideas. Garrosh embodies his desire to eliminate all weakness, including that of his own minions,. Gul'dan appropiately synergizes with Hand of Gul'dan and heralds powerful demons based on how much is sacrificed. 

Xevozz is a love letter to Academic Espionage and is meant for greedy Thief Rogue decks. I'm a bit concerned he's too slow and/or easy to remove, but I thought I'd play it a bit more cautious with the first go around.
Reckless Seeker is also greedy, but allows for more curated value. You get to pick which spell gets added to your deck, but only certain kinds of spells will be unconditionally good cast automatically. You could also semi-curate when you draw it with Lorekeeper Polkelt!

Two of my initial ideas. Aethas Sunreaver serves as a powerful value tool for Control decks, but comes at the cost of being quite slow and not immediately impacting the board. EVIL Propagandist looks to give some 'oomph' to self-damage and Lackey strategies for Warlock, which were a bit lacking at the time.