Wondering how to get Maelstrom Portal?
You unlock Maelstrom Portal by beating the Shaman class challenge in the Parlor, first wing of the adventure – One Night in Karazhan.
The class challenges are easy and only take a few minutes. To unlock them however you need to beat all three bosses in the first wing, The Parlor.
Here is the card you unlock, Maelstrom Portal.
It’s a 2 mana Shaman spell, with the effect: Deal 1 damage to all enemy minions. Summon a random 1-Cost minion.
A decent card, needs some play-testing to fully grasp how good this card is and i which decks it’s going to fit in with.