The strategy I've been going for is to use bubbling mucks to get Griselbrand out early, and/or Diabolic Ritual after bubbling muck to find whatever specific cards I need (Often Sorins Vengeance to finish off an opponent). Other than that, enchantments on my Vampire Nighthawks or Tormented souls for dealing most of my damage.

It's been working pretty well against my friends, but any advice would be appreciated.