Hearthpwn

Well this is the most fun demonlock deck I've ever played, and it sticks to my purpose, that is, making it fun. And even there's  a great time laddering this since it has techs and answers to almost any threats. 

I only found hard times against control warriors, but all the other matches tend to balance towards this deck's benefit.  Even huntards have a bad time against it, since you have so many ways to stop it from running you, like the first turn taunt with Voidwalker, or the lots of clears from turn 4 and on. And also there's Mistress of Pain, who makes a lot of healing along the time, and almost never gets dealt with because you will be constantly putting worse threats of the field and pressuring him while at the same time controlling his board with removals and cleaning for the face!

Have fun!

I accept suggestions :)