I'm currently running
1 Backstab
2 Preparation
2 Shadowstep
2 Sinister Strike
2 Eviscerate
2 Shiv
1 Bloodmage Thalnos
2 Novice Engineer
2 Fan of Knives
1 Brann Bronzebeard
2 Gnomish Inventor
1 Kezan Mystic
2 Tomb Pillager
2 Azure Drake
2 Dark Iron Skulker
2 Gadgetzan Auctioneer
1 Alexstrasza
1 Malygos
The Kezan Mystic is an experiment to tech vs Mage, because if they are a similar combo deck running Ice Block, it's the only way to win. The slot used to have Chromaggus but I find Chromaggus too much win-more when it comes to hand size, because he only works when you would have been drawing anyway--in fact I often have to avoid drawing with Chromaggus on board in order to not overdraw!
Looking at your list Awaclus, my thoughts are: I don't see what the Jeweled Scarab is for (I'd rather play Gnomish Inventor to draw from my specialized combo deck instead of random 3-cost cards), you probably want Brann Bronzebeard if you're running Krakens, and the Unstable Ghoul and Blade Flurries seem like overkill (I feel fine with just the 2 skulkers and 2 fans).