This is the Jade Chieftain HS Shaman Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s a Shaman class minion and the card text reads: Battlecry: Summon a Jade Golem. Give is Taunt.
You can get Jade Chieftain 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.