One thing I noticed with Boomerang that I haven't seen mentioned yet, is that unless you have Flying or Animate Weapon in your deck, it makes it pointless to bring any other weapons. Boomerang will replace any weapon you put out beforehand, and then it goes back in your deck (maybe), leaving you with no weapons. It'd only be viable in a deck with Flying or Animate Weapon, or with only multiple Boomerangs. Not saying that's good or bad, I'm not sure, but something to think about.