Hearthpwn

This is a deck I've designed to take advantage of the new legendary Priest Quest. I've played a few games with it so far and it seems to hold up well. Beat C'thun Priest, Murloc Shaman, and a Rogue (couldn't figure out their deck type). The early game lets you hold out fairly well until you can get the quest fulfilled and overwhelm your opponent with N'zoth summons. On top of that, N'zoth can be used to fulfill your quest if you've played at least 4 deathrattle minions before you play him (since the Quest only requires summoning, not just playing).

I don't understand Radiant Elemental in this type of deck.
This is not a spell deck. So I would cut that for another deathrattle minion. Cairne Bloodhoof for example. 
I don't understand why he's not in your deck.