Hearthpwn

Grand Archivist is not that good of a card in your deck.

Lets see, if he casts potion of Madness, you will not reap any benefits (since it is End of Turn), Spirit Lash can potentially kill your own guys, Dragon Fire Potion brings him down to 2 health, any may hurt a potential Lich King / barnes / Obsidian Statue / Freed from Ember summon. And then comes Psychic Scream - no, you don't want it to be casted by the Archivist. Not at all - it will hurt you most of the times more, than the enemy. Generally, it seems to have no synergies with your deck - you only have big minions and Dragons. So, it ends up as a board clear when you are behind, but otherwise? You don't want to cast it, if you have fatties out. After all, you don't want to add another Lich King to their deck :P 

Shadow Reaper Anduin as well. You have next to no low Mana cards you can spam, meaning, most of the time it will be a '2 mana, deal 2 damage', which is fine, yet not great. Though it is a board clear, it also hits your summoned Dragons (they are 5/5 after all), as well as some Minions freed from Ember (again). If you are that far into the game, chances are great that you already overwhelm your opponent. And why no Lyra? If you have a spell heavy deck, Lyra is a very nice addition. Especially if you add some cheaper spells ... like pain / death 

I think you need to throw in some more low cost control spells.