There are a lot of cool interactions in this deck. My favorite being Shudderwock's. Whether it be restoring your hero to full health from Reno Jackson, summoning a Twin Emperor Vek'nilash, using C'Thun's ability, or just having a general feeling of Yogg-Saron, Hope's End
Removed Marin the Fox, I think it's a little too slow. Master of Evolution, I am really focused on Shudderwock and C'Thun so I don't want this evolving Shudderwock and canceling his Battlecry. Jade Claws because I needed space and that was the least needed card left. And finally, The Mist Caller, let's just say there is a reason he has never seen that much play.
Added: Baleful Banker, saw its interaction in the reveal stream, looks great. Works with C'Thun too. Doppelgangster and Saronite Chain Gang work nicely with Shudderwock. And finally Stonehill Defender because out of my jungle. (Who wouldn't like some extra taunts? *cough cough* Al'Akir the Windlord or White Eyes.
I feel like certain cards like Evolve, Deathseer Thrall, and Master of Evolution could work, but only in their own archetype. I also feel like cards such as Arch-Thief Rafaam, Bonemare, Dr. Boom, or even Big-Time Racketeer could work. The choice is yours.
Thank you for taking your time to take a look at this deck, I can't wait to try it out. Tell me what you think would work better or what you may try.