The introduction of the Standard vs. Wild formats in April 2016 was an issue that the developers knew since Hearthstone's initial release that they would need to address; according to Brode, as new cards were introduced to the game, they recognized that new players would start to find the game inaccessible, while adjusting the balance of the meta-game of which cards from previous expansions had proven over- or underused. The ideas for how to actually implement Standard mode started about a year before its introduction. Though they will continue to design the game to maintain the appropriate balance for the Standard format, they will also monitor how future cards will impact the Wild format and make necessary changes to keep that mode entertaining. With the Year of the Mammoth changes to Standard, the designers opted to move some Classic cards to a new "Hall of Fame" set that is not usable in Standard. They found that these cards were often "auto-includes" for certain deck types, and created a stagnant metagame around those decks, and opted to move them out of Standard. As compensation, those that own these Hall of Fame cards received the arcane dust value of the cards they possess while still being able to use those cards in Wild. The "Hall of Fame" format also allows Blizzard to move Classic cards that have been (purposely weakened) previously to be un-nerfed and moved into the "Hall of Fame"; Blizzard found that players using Wild decks were impacted significantly by these nerfs and this approach would allow those deck formats to still thrive without disrupting Standard. To make up for cards moving out of Classic, Blizzard may consider bringing in individual cards from retired sets into the Classic set that they believe would be suitable for Standard. The associated switch of Arena mode from Wild to Standard with modified card rarity distributions with the "Year of the Mammoth" update was aimed to keep the pool of cards available to draft smaller, increasing the chances of drafting cards that they had intended to be used in synergistic combinations from the individual expansions.. Hearthstone is getting an update next week -- 9.1 releases on September 18. The update is to implement all balance changes that were outlined and discussed . Hearthstone staples Innervate, Fiery War Axe and Hex are amongst a small selection of cards getting nerfed in up-and-coming patch 9.1. Blizzard announced .