Hearthpwn

This is the deck I'm currently using to climb up legend ladder. It has a strong showing (albeit in a small sample size) but results against cube lock and experimental deck types like Tempo Rogue, all versions of Paladin, and Rush warrior are promising. It does give up some matchups like to shaman and can struggle against other decks that don't need a board to really win (like odd hunter). 

Against anything you think is going to be aggressive you want to grab Raven, Stonehill, doomsayer as priority muiligans. Don't be greedy with doomsayers. If you already have 2 of three of these you can keep a board clear or an Arcane Tyrant specifically if you have a Raven and/or a board clear. Here your game plan is to simply clear the the board at good moments to eventually get to your late game where you hopefully have Jaina. Your win condition is going to be almost always getting to a point where your opponent cannot damage you more than you can heal. 

Versus control, or specially cubelock, you'll want to keep an early drop, polymorph, and Jaina if you happen to have it. Jaina extremely important in the cubelock matchup as getting her out before he can Guldan can be massive if he doesn't kill you with it. Polymorph too is a key card as you can use it to make the Guldan pool weaker. Once you identify cube or control you can begin to use your polymorphs accordingly. Doomguards have high priority to be polymorphed in the cube matchup reviving them is mainly how the warlock will win. However, don't let giants just linger around unless you have ways to stall through a cube on that. Manage your draw too, almost all games against warlock come down to fatigue or close to it. 

If you're wondering why I don't have Harrison in the deck. I just don't own him.