This is the Maelstrom Portal HS Shaman Card being released as part of the new adventure, One Night in Karazhan. It’s another portal card and another good card.
The card reads: Deal 1 damage to all enemy minions. Summon a random 1-Cost minion.
So the Shaman theme is to do damage to the board and summon a 1-cost minion. This isn’s as impactful as the Firelands Portal, but at a much lower cost it will have a place in some decks that want cheap AOE.