Is this a good Blackwing Deck?

I think you should get it fixed up to the Sept. 2010 Ban list first, like Break off Brain and Heavy, and replace with Monster Reborn and Dark Hole. Kycoo and Mistral aren't needed and Black Whirlwind is at 1 now. Get Book of Moons and Vayus, and then wait until 8/31 when they reprint Dark Armed to Super, saving you ~$40 if that Dark Armed is Gold.