Hearthpwn

The idea of the deck is to play smalldrops in the earlygame and let Guzzler summon your big minions, after you got Malygos on the field its very easy to control the board. So you have to keep your small damage-spells or your small minions and shuffle the 3 big drops back into your deck.

I added Mirror Image for the earlygame and the synergie with Mana Wyrm, after all you need a few taunts to keep your hero save, so i added Annoy-o-Tron as well.
With Sorcerer's Apprentice you should be able to play your boardclears or small clears in time.

I added Ragnaros the Firelord, because he is an 8/8, pretty huge minion so your opponent needs about 2 minions to kill him, and he is also clearing big drops very easy with his passiv.

I added Kel'Thuzad, because he synergizes well with your smalldrops, for boardclears, as well as with your big drops, which might be summoned.

Good luck :)