Blizzard’s mega-popular competitive game is getting a bunch of new card and mechanics with the League of Explorers adventure mode, which will launch next week.

Announced today at Blizzcon, League of Explorers will be a four-wing pack full of bosses and new legendary cards. It’ll also add new game boards, some class challenges, and a new mechanic called “Discover” that will present you with a hand of three random cards (based on certain conditions) and let you pick one. “Discover a (3) cost card,” for example, will offer you three cards that cost three mana.

League of Explorers hits Hearthstone next Thursday. You can see some of the new cards in action in this excerpt from today’s Blizzcon announcement.

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