Hearthpwn

Just your classic Freeze/Cyclone Mage with a coupe of twists. I added Leeroy Jenkins because it actually helped me win a lot of match ups.  Sandbinder is really good especially when he's in the opening hand. Polymorph is not really necessary but i added it cuz of the present meta. I always lose vs "Magnetic" Zilliax or Eternium Rover also Annoy-o-Module so i needed a card to neutralize all of them and Polymorph did  well vs control warrior and mech paladin. 

The tips that I would give about this deck  is that you need to mulligan according to your match ups. But always keep Mountain Giant  Mana Cyclone  Luna's Pocket Galaxy  Arcane Intellect  The rest can be mulliganed acoording to the deck you're facing. 

Usual Strategy: You got Mountain Giant + Conjurer's Calling or Mana Cyclone + Sorcerer's Apprentice + cheap Spells and/or Luna's Pocket Galaxy if you still have big minions in your deck

Popular Match Ups:

Token Druid: Keep Frost Nova

Control Warrior :  The Hardest match Up :Try to mulligan everything for Mana Cyclone or Luna's Pocket Galaxy

Mech Hunter : Frost Nova is a must in this case otherwise you'll probaly lose 

Murloc Shaman : Again Frost Nova and/or Ray of Frost

Mech Paladin : Polymorph destroys this deck but you must play it after he plays all his magnetics mobs

I believe that's it...so Good luck and have fun playing this deck :D