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Along with 135 new cards, Blizzard is stuffing the expansion with free single-player content which anyone can access for free (the fun-looking Choose Your Own Adventure-like Dungeon Run mode).
There are new card mechanics, too: Recruit, to pull a minion from your deck; Spellstones, which are spells that increase in power as you play; Unidentified Items with semi-randomised effects; and the first Legendary weapons.
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