Jorbles, I had the same thoughts after completing the new wing. New version:
Circle of Healing x2
PW: S x2
Northshire Cleric x2
Twilight Whelp x2
SW: D
Velen's a Chosen x2
Blackwing Tech x2
Shadow Madness
Auchenai Soulpriest x2
Dragonkin Sorcerer x2
Hungry Dragon x2
Holy Nova x2
Blackwing Corrupter x2
Sludge Belcher - Lightbomb
Drakonid Crusher x2
Chromaggus
Alexstrasza
Nefarian
Let me know how it does! I think Rend might still have a home somewhere in the deck, but I'd defer to your experience actually playing with it.
One change to the decklist noted above -- I dropped the Blecher for a Lightbomb because I felt I didn't have the ability to clear a board enough, especially in the later game.
Experience so far (all low ladder): it feels possibly viable, maybe. Like, I'm winning more than losing, but that's probably just as much my opponents as it is my deck (and my skill). Generally games feel like this:
Early game: dropping value to keep board control (so 2/3 Whelp, 3/5 Techs, coined Hungry Dragons) and/or trying to draw important cards with Cleric heals and PW: S.
Mid game: one of two things - increase big board presence by buffing Sorcerers (Sorcerer + PW: S is a 4/8 for 5 mana and only one card "spent" on T5) and Hungry Dragons or clearing the board with Soulpriest + COH or Holy Nova/Lightbomb. I guess Corrupter damage comes in here, but it's only good against single targets.
Late game: I'm not winning with single big minions, but more two-four heavies, like buffed mid-dragons or 9/9 crushers.
I think the three big dragons (Chromaggus, Alex, and Nefarian) are definitely not equal. Like, Alex is there as a save for me or to get instant pressure on my opponent if I've been focused on the board the entire game. Nefarian is almost always great, as two free spell cards does make a difference. Chromaggus has been the weak link, and is probably better off replaced by something else (Boom? Rend?).
Cards I wonder about...I took out Azure Drakes, as the bodies are weak and the spell power only helps Novas, but I wonder if at least one might not be a good idea anyway. I have no taunts, which sometimes adds to the feeling of helplessness when I don't draw the board clears. Do I want my Belcher back in? Or a Sunwalker?