Hearthstone will soon receive the new Core Set and Classic Format as part of some upcoming changes.
After set rotation this year, Standard will include card sets from Year of the Phoenix (Ashes of Outland, Scholomance Academy, Madness at the Darkmoon Faire, Darkmoon Races Mini-Set). Also included are the next expansion, and the new Core Set.
This set will be free for all players. It will also replace Basic and Classic in Standard as a curated selection of 235 cards. Some cards will return from previous sets, however. Meanwhile, 29 cards are completely new. You can unlock these cards by leveling up each class, with cards automatically granted equal to players’ level when they login for the first time after the rotation.
Classic Format will also launch which invites players to craft decks and compete using Hearthstone’s original 240 cards. Classic’s reward systems, rank systems, and seasons will function the same as Standard and Wild. Additionally, it will have its own matchmaking pool. Alongside the release of Classic, deck slots will increase from 18 to 27.
You can learn more about these upcoming changes here.