Professor Lich
Member
Turn 1 put it on the blue side so it only takes 1 damage a hit. Netherspite then never attacks the whole game.
Maybe it's just Void Walker then. I've used other low cost taunts and they've gotten Roar'd or Mulched, or whatever.
Edit: I do have to say though, it's also pretty easy to be Priest and put down a Shieldbarer and that lasts forever.