Hearthstone’s next Adventure: One Night in Karazhan has been announced. It will go live on August 11th.
Similar to previous Adventures, there are 43 new cards, 4 total wings: The Parlor, Opera, Menagerie and Spire, a new cardback, class challenges and a new game board. The Prologue is free to all players, where you will face off against Prince Malchezaar.
One Night in Karazhan introduces the portal spell cards such as the Firelands Portal which will summon a minion and perform magic.