Deal 1 damage to all enemy minions. Summon a random 1-Cost minion.
They bill this as a popular resort attraction, but they try and get your money up front.
Maelstrom Portal is a Shaman class spell card. Players can obtain this card by beating the Shaman Class Challenge in the One Night in Karazhan Hearthstone Adventure.
Maelstrom Portal is one of the Portal-Spells introduced in the One Night in Karazhan Card Set. All portal spells function similarly in the sense that they have a primary effect such as deal damage or heal, and as a secondary effect summon a random minion of certain Mana cost on to the board.