This is the Jade Idol HS Druid Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s a Druid class spell and the card text reads: Choose One – Summon a Jade Golem; or Shuffle 3 copies of this card into your deck.
You can get Jade Idol 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.