Hearthpwn

For early game you want to mulligan for low cost cards to maintain board control/tempo (trades are fine). I personally ditched the feral spirits and instead picked up a storm-forged axe and have had success with it. 

As far as hex's/poly goes, it's imperative that before you do the earth elemental combo that you've had your oppent blow those cards on your other minions such as fire elemental or a beefed up unbound you get the gist. You have to play around those cards and anticipate them. 

You're not going to burst down opponents with this deck, it is all about outlasting via control and then when they've exhausted all removal you finish them with your earth elemental/rag etc. 

Solid deck, I subbed Ragnaros for Cairne Bloodhoof though. The games come down to the wire but  if you can make it to turn 10 chances are you will win.