This is the Kabal Chemist HS Tri-class Card from the upcoming expansion Mean Streets of Gadgetzan.
It’s a tri-class minion as is part of the Kabal faction of cards. Meaning it can be played by Mage, Priest, and Warlock.
The card text reads: Battlecry: Add a random Potion to your hand.
You can get Kabal Chemist by opening packs from the Mean Streets of Gadgetzan set.