Hearthpwn

This is a deck I am super excited to try! This is certainly not the best build, it uses a lot of new and questionable cards, but I think some form of this deck might finally be decent!

The new Cards:

Dead Ringer: Amazing card! This in conjunction with Twilight's Call will mean your hand is full of deathrattle minions. I envision this deck completing quest by turn 5-6 easily, making it a strong anti-aggro deck. 

Reckless Experimenter: I'm not playing many combos with this card. The only real crazy combos are Experimenter+Voodoo doll and Experimenter+4 drop+ Cube on turn 8. This card should be really useful against aggro to just dump the cheap death rattles from your hand and complete quest quickly, while against slow decks you can save it for bigger plays.

Kaboom Bot: Probably one of the more questionable inclusions, but its a great card to combo with Experimenter and a very annoying card to ressurecct with Twilight's Call. Seems fun, at the least.

Weaponized Piñata: I always liked Arfus in quest priest for the slower matchups, this card has much better stats and accomplishes something similar. We will see about this card, both if Death Knight cards are much better or if the meta doesn't call for this kind of value card. Great card to double up with cube+experimenter and ressurect.

Piloted Reaper: A decent card in this deck, a deathrattle that summons a strong 2 drop deathrattle most of the time. Can really fill the board with experimenter+cube.

Old Cards, but new in the deck

Azalina Soulthief: I think Shudderwock might be popular, and this is a damn fine counter. Now that Azalina copies mana cost, Shudderwock is crazy in this deck. It: 1. Sets your health to 40 (Amara) 2.Destroys all Shudders from your opponents board (Shadowreaper) 3. Shuffles cards into your deck so you win fatigue (Archbishop) and 4 recopies your opponents hand (Azalina. It also uses Voodoo doll battlecry for BM

Voodoo Doll: Certainly not sure about the doll, its great on 5 with experimenter and can be combined with Spirit Lash but its a bad ressurect target. Not sure if its worth it.

Carnivorous Cube: Crazy strong with experimenter. In addition to the aforementioned combos, it can be used with Plated Beetle to gain tons of armor, which might be a plan vs combo decks. Also can be used on experimenter herself for some crazy turns in the future. Maybe I should be playing 2.

Other ideas:

Dollmaster Dorian: Great card if you have some Dead Ringers ready to trade. Seems a little inconsistent

Crystallizer: A decent way to gain some armor against combo, as you can easily heal the health you have missed. Seems weak otherwise as it doesn't synergize with the deck otherwise. Also bad with reaper

Zilliax: Honestly, we play a shocking amount of mechs, so maybe this deserves a look. Special shoutout to Replicating Menace, though I am unsure if the deathrattle counts towards quests when magnetized/

Devilsaur Egg: Good with experimenter, but we have no way to kill it otherwise. Needs more synergy.

Explodinator: Its two deathrattles for one, but I don't think its good enough.