G/W seems to just attack on one obvious angle - I think it should get hated out pretty easily.So....realistically speaking, the top decks I should expect to be facing at States are G/B Desecration Demon decks, U/W Control, G/W Aggro, Mono Red, and possibly W/B Baron/Obzedat decks.
I'm not sold on the new B/G midrange lists yet. Losing Mutilate and Thragtusk were huge. Gaze of Granite definitely comes in, but it's much less impactful. We're playing Caryatid to help the mana, but still. I like Reaper of the Wilds taking Thragtusk's place in the deck as the hard to deal with board presence, but the deck hurts itself a lot. And again, I think the removal is just too slow.