This is the Tar Creeper HS Card from the Journey to Un’Goro expansion due for release in April.
It’s a Neutral class minion and the card reads: Taunt Has +2 Attack during your opponent’s turn.
You can get Tar Creeper by opening packs from the Journey to Un’Goro set.
*An interesting mechanic we haven’t see used in this way before. It’s also an Elemental, so keep an eye out for additional synergy.