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Hey guys, Zed here. I've never had such a high winrate with any deck EVER. I usually class a great deck as 60%+ winrate but 71% is insane. With cards like dirty rat that no-one expects completely destroys decks such as Quest Mage, and other Kazakus decks.

General Mulligan: Acolyte of Pain, Northshire Cleric, Shadow Visions, Dirty Rat (Aggro).

I would be happy to post mulligan guides, for every class. And replacement choices for the deck, if this post gets a few likes i will make them. This deck is exceptionally well at performing against all classes.

[UPDATE]

Okay this post got alot more views than i was expecting, and people have been asking for help. So i'm going to post the Mulligan guides for each class.

Warrior: Warrior is most likely going to be aggro so you want to look for your anti-aggro cards like Spirit Lash, and Dirty Rat. Sometimes Holy Nova and Dragonfire Potion isn't a bad keep, anything that removes the board is always good.

Shaman: Shaman is going to be some form of evolve Shaman, and the only way Shaman can win is through board control, and big evolves. You want to look for AoE cards like warrior to remove them minions and eliminate a turn 5 Thrall evolve.

Rogue: Rogue is obviously going to be Keleseth. This matchup is kind of a 50/50 win situation, if the Rogue draws Keleseth on turn 1-2 you're going to be in trouble. Your best bet is to look for cycle cards to draw answers such as Power Word: Shield, Acolyte of Pain, Radiant Elemental is always a good 2/3 body to contest the board.

Paladin: There isn't much Paladin running around at rank 5+ but if there is, it's most likely going to be Murloc Paladin, again you're just going to want to look for board clear. Spirit Lash, Dragonfire Potion, Holy Nova.

Hunter: Hunter is your worst match up however that doesn't mean you can't win. Hunter will always have a minion on board by turn 3, and Bear Shark seems impossible for us Priests to deal with. I would always keep Potion of Madness to trade off the 1/1 Alleycats or the pirates. Against hunter you want to keep Greater Healing Potion aswell, because you know... SMOrc.

Druid: After the nerfs there are significantly less druids, but Jade Druid is still running around, best way to defeating Jade Druid is to look for minions that draw your Raza/Anduin combo such as Gnomish Inventor, Novice Acoloyte, and Acoloyte of Pain.

Warlock: The only warlock on Ladder is either Zoo, or Control. It's most likely going to be Control, if so ALWAYS keep Raza/Anduin as the earlier you have the combo, the more you're going to win.

Mage: Again with mage, it's either going to be quest mage or secret mage. And the best way to defeat this, is to burst them down before they do the same. Look for your cycle cards and draw that Anduin/Raza before they pop the quest/Antonidas. Another good keep is Dirty Rat, i have literally won games against quest mage by playing Dirty Rat, into there apprentice/Antonidas, just make sure you have removal in hand.

Priest: The mirror matchup. So this is going to be whoever draws Raza/Anduin first is most likely going to win. ALWAYS keep Raza/Anduin, turn 5 Raza into turn 8 Anduin and you've got it in the bag, don't hold Anduin back to eliminate one of his big minions, sometimes it's even best to kill your own 5/5 Raza to get that deal 2 damage hero power on board.

If you have any more questions, just leave a comment. Any comments/upvotes would be greatly appreciated.

[UPDATE] 

Front page of Hearthpwn in 1 week. We did it bois B)