Hearthpwn

Since the reveal of the priest death knight card I've been thinking up this deck!

I might be trying to do to much with it. My current thought is that you mulligan the quest away and play it with Lyra to gain additional spells. You should still be able to complete the quest when you drop N'Zoth.

I'm going to play something similar to this day 1. Let me know your thoughts

I think you're trying to hard to make corpse taker better. 

you can literally cut corpse and the 2 divine shield minions if you so choose for tar creeper tolvir and servant of kalimos.

gives you better early game vs aggro and a chance to get another lyra.

you can also drop forbidden shaping for elise trailblazer to combo with shadow visions or just have more late game potential.

This does look like an interesting idea. Just don't know how interesting it will be. definitely fucks over jade druid though with the tech choice.

Since you put Bloodmage Thalnos in you should add more damage spells; at the moment the only one is Dragonfire Potion. In my opinion Spirit Lash would be great. You'd get a bigger board clean (really useful with hunters) and you'd heal more.
I would also change the Shadow Ascendant to add another low cost spell for Lyra.

I made a similar list but not N'Zoth oriented, maybe it can help you