If you went with 6 devourers you could make it into a quanta denial deck. You can also use steals to either take pesky permanents or their pillars if it will screw them. If you were to go that route, keep the deck at 30 cards because you'll need the devourers as soon as possible. I'd start by taking the gargoyles out to make room; unupped they are not that great. It might be good enough to reliably beat bronze, but I'm not really sure; I haven't really played bronze/silver since I didn't need to win unupped rares when the arena came in.