This is the Hemet, Jungle Hunter HS Card from the Journey to Un’Goro expansion due for release in April.
It’s a Neutral minion and the card reads: Battlecry: Destroy all cards in your deck that cost (3) or less.
You can get Hemet, Jungle Hunter by opening packs from the Journey to Un’Goro set.
*Interesting battlecry, without the body of the stats being good for the cost it’s hard to see this card being played.