I tried everything, every possible deck and I just couldn't get control warlock to work. Then I thought about an old card called C'Thun that is hardly seen anymore. I put it in the deck and it worked, I suddenly started winning games again! I truly believe I have cracked the code now.
This is a powerful and effective deck with three win conditions. Lord Jaraxxus, Kazakus and C'Thun. I also put in Bloodbloom as there is always a spell available for it. I have won countless games versus aggro decks with a turn six Kazakus into Bloodbloom into a 10 mana spell.
The only bad match-up I have faced with this deck is hunter. I have yet to lose from quest rogue and warrior with this deck. Pirate warrior also goes well, especially when I draw Golakka Crawler.
I hope you enjoy the deck! Good luck with it