Hearthpwn

If you like this deck upvote so more people will have a chance to see it.

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Mulligan:

always keep: Springpaw or Worgen Infiltrator -> Dire Wolf Alpha, Hench-Clan Hogsteed or Scavenging Hyena (specially when you have Springpaw or Unleash the Hounds against aggro/token deck) -> Animal Companion or Jungle Panther

vs aggro: Headhunter's Hatchet (specially when you will have a beast)

Upgrades:

Jungle Panther -> Leeroy Jenkins (it provides more dmg and it's a finisher that will win you a lot of games)

Card that might be included:

Shimmerfly, Helpless Hatchling. Hunter's Mark, Revenge of the Wild, Master's Call + Dire Frenzy, Houndmaster, Savannah Highmane

Midrange version with Zul'jin:

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General gameplan:

This is a simple deck but it requires you to think ahead and train your quick math. You have to always think: 'how many turn do i need in order to win', 'can i trade right now' or 'if i will top deck skillcommand, is it enough to win the game'. During the early game you want to mostly get the 'control' over the board. This means that you might value trade or kill a minion that's threating for you (Northshire Cleric etc.) After turn 3 you want to almost every single time use your hero power (you deal dmg and you do not have to waste a card). It's super important to play on curve and do not waste mana. 

Proof: