This is the Jade Claws HS Shaman Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s a Shaman class weapon and the card text reads: Battlecry: Summon a Jade Golem. Overload: (1)
You can get Jade Claws by opening packs from the Mean Streets of Gadgetzan set.
If you want to find out more about Jade Golems and how this mechanic works check this post.