This is the Gluttonous Ooze 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 your opponent’s weapon and gain Armor equal to its attacl.
You can get Gluttonous Ooze by opening packs from the Journey to Un’Goro set.
*Good to see more Ooze, I don’t see this card making play though.