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Curse of Naxxramas will open its gates over the course of 5 weeks, opening wing by wing. The first wing of Curse of Naxxramas, The Arachnid Quarter, will be available free for all Hearthstone players. If you wish to venture further into Naxxramas to collect all of the new cards for your collection, each wing besides the Arachnid Quarter can be purchased with in-game gold or real money, whichever you prefer. As each wing is released, the cards available in each wing will also show up in your Arena picks, even if you have not earned them for your personal collection yet.
Blizzard developers, "Beware the Curse of Naxxramas"Along with adventure mode being released, Blizzard have stated that they will be releasing 30 Naxxramas themed cards to go along with the expansion. Most of these cards seem to be deathrattle-centric, and Blizzard have also stated that these cards will only be available from the wings of the Naxxramas adventure mode; in other words, start saving your gold for each wing! They have already revealed a few cards, involving one new legendary Baron Rivendare, but 4 more are planned state developers. Only time will tell how these new cards influence the metagame!