This is the Grimestreet Smuggler HS Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s one of the tri-class cards and belongs to the Grimy Goons, meaning it’s playable by Hunter, Paladin, and Warrior.
The card text reads: Battlecry: Give a random minion in your hand +1/+1.
You can get Grimestreet Smuggler by opening packs from the Mean Streets of Gadgetzan set.