I just reached 12 wins with a Drek'thar Overload deck, only losing to a paladin with Grommash's Armguards and Avenging Armaments. My current rating in Heroic Duels is 7315, playing a variety of decks. (My best run with Drek'Thar is totally 4 wins, Blizz pls)

The only slot I might want to change next time I try this deck is Windchill (the draw feels unnecessary with this hero power) for Landslide (felt really good when generated, works insanely well with Natural Force).