This is the Arcanologist HS Mage Card from the Journey to Un’Goro expansion due for release in April.
It’s a Mage class minion and the card reads: Battlecry: Draw a Secret from your deck.
You can get Arcanologist by opening packs from the Journey to Un’Goro set.
*It only draws a secret to your hand. Not to be confused with the Mad Scientist effect of playing a secret.