Unfortunately for Hunter (if I had a nickel for every time I typed that...), the only stings that currently exist in the MMO are Viper, Serpent, and Scorpid. It's unlikely we'll see any additional, cheap Stings printed in the near future, so we'll just have to hope that Scorpid will be a 1-cost staple and/or Serpent Sting somehow gets buffed in usefulness. Even then, I have never liked packing cards that do absolutely nothing without having a card in play, especially when the requirement is extremely narrow (see Blood Boil...then see Blast Wave).
As a Death Knight fanatic looking for any sign of potential, my favorite card of this bunch is definately Army of the Dead. I do hope the class gets a solid form of interrupt protection to go along with it, but I suppose beggars can't be choosers and playable rares are always appreciated in my book.
By the way, a UDE member mentioned during Worlds that the new DK races in Scourgewar are going to be Night Elf and Undead. I look forward to using the new Undead hero with AotD and wiping the opposing board of their Myriams/Dimzer/etc, while keeping my Dethvirs safe and sound to help protect the new Ghoul tokens from certain board wipes. Also, I plan on dropping the Spectral Kitten on the following turn to give my Ghoul swarm some extra pounce for the ounce. On the jankier side of things, I would also like to combo this card with Metzen the Reindeer for a fun way to generate 4 bonus Ghoul tokens, while filling up Minions of the Shadow Council and keeping this card somewhat relevant against solo. Arrrrrr-braaaaains!

<----WTB Official Obliveron Avatar plz. Viva la Demons!