Not really...
Umm the point of this post is what?
Let's think about this for a second, CBN immunity (or protection) against over 50% of the hero's in the game? It's not even like wives where your opponent has to draw or you have to force them to draw, you just drop him down and boom . . . I blocked you.
That would be ridiculously broken. OP would be the a massive understatement.
CBN by evil is cool, it would allow him to band to orange or gold KoT or orange or brown foul Spirit without negating himself.