This is the Stone Sentinel HS Card from the Journey to Un’Goro expansion due for release in April.
It’s a Shaman class minion and the card reads: Battlecry: If you played an Elemental last turn, summon two 2/3 Elementals with Taunt.
You can get Stone Sentinel by opening packs from the Journey to Un’Goro set.
*18 worth of stats with two taunts for 7-mana makes this a great value card in Elemental decks.