This is the Aya Blackpaw HS Legendary Tri-Class Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s a tri-class minion as is part of the Jade faction of cards. Meaning it can be played by Druid, Shaman, and Rogue.
The card text reads: Battlecry and Deathrattle: Summon a Jade Golem.
Jade Golems are minions that each time you summon one it’s stats will increase by +1/+1. So, your first Jade Golem is 1/1 as per below, then 2/2, and so on.
You can get Aya Blackpaw by opening packs from the Mean Streets of Gadgetzan set.