Also, consider dropping the Lich King and adding another Endgame. Also, also, replace the demons in the deck with something more aggressive. Maybe something that deals direct damage or subverts taunt minions somehow. Right now, this deck tries to be a slow control deck that sets up a bunch of defenses and tries to “sit back and relax” when it should be trying to deal more damage to the opponent.

Edit:
*Struggles significantly against other extreme value priest decks. I have some cards to avoid giving them value through **removing** their minions, but a 40-card odd-cost deck only has access to so much non-destroying removal.