After a truly agonizing amount of time spent in Diamond, this is the deck that finally put me over the top to Masters, going 14-5 in the final stretch. This is basically a classic midrange deck, but with the best Hero payoffs. A few comments:
Gold-Plated Revolver - a +3/+3 weapon for 1 mana is a superb deal, and you have units like Plunk and Quinn with Aegis to put it on. This card won me several games by itself.
Plunk Wumpkin - this card is utterly insane, and I have a hard time playing decks that don't include him. Card draw, Aegis - stick a Revolver on him and your opponent is in trouble.
Kako, the Bodyguard - I admit this one is a little suspect, but there wasn't any other good Heros at three, and his ultimate did win me a few games. Plus it's nice to have at least one lifesteal in the deck.
Chirganth, Ice Regent - a big flyer with a nice Contract ability. This deck doesn't even use the spell damage part, and it's still really good!