Hearthpwn

The deck is excellent in this season. Stop aggro warlocks and hunters. Easy going to play you don't even need the instructions. Just learn by play and enjoy ! It leads me to top 100 EU and I want more...

Here is the proof:

I read comments and i decide to add a mulligan strategy, some important tips and my thoughts about matchups

Ok let's go

Hunter

Let the hunt begin. Hunt a hunter. Important thing during this match is to take care of board. In the early phase take over control with Zombie Chow and  Undertaker. Don't put on the board too many cards, because of Unleash the Hounds. 2 - 3 is optimal number.

In mid-game and late Cabal of Shadows, Sludge Belcher and Holy Nova perfect clean the board.

Savannah Highmane Go home! I have for you Silence and Shadow Word: Death. 

So: Try to keep on your hand card with a small mana curve. But if you have on your start hand combo Auchenai Soulpriest & Circle of Healing hold them. These cards can win you a game. It's not a very difficult matchup. Trust me. If you lose against Hunter You probably don't have a fortune or draw was useful. 

Aggro Warlock

This matchup is really nice. Very similar to game with hunter. 70 % winrate even when you haen't got too much skill. Zombie Chow, Undertaker, Auchenai Soulpriest + Circle of Healing, excelent clear the board and stop the aggro. Keep on  your hand card's with a low mana curve and that's all.

Palladin (Shockadin or control)

Matchup isn't very bad when you thiniking in match. Be careful of Wild Pyromancer + Equality. If you have on your hand Silence or Mind Control (Not in mulligan!) Don't lose it too fast. Sometimes better wait with these cards for Tirion Fordring.

Warrior

Very slow matchup. Important thing: Don't let him draw too many cards! Cabal Shadow Priest take control of Acolyte of Pain. Leave alone other cards. Focus on him. 
Take over or fast kill! Also be careful of Brawl. Another Tip: Be patient. Let Warior lost his Shield Slams and Executes. Try to control the board.

Handlock

Maybe one day Handlocks won't be play. Really hard matchup. It's a counter on this deck. Chance for win 1/20.

Another Tips soon ! :)