A new Hearthstone expansion, Across the Timeways, is set to be released on November 4, and a pre-release Tavern Brawl is available to test the cards in advance.
Players can open their Across the Timeways packs and use the cards in this Brawl only. Some decks to try in this pre-release Tavern Brawl include those that utilize the newly obtained cards.
Many players likely already have some Across the Timeways packs from drops, in-game events, or pre-orders, which can be opened and used in the Brawl.
you can open those packs right now, and any cards you get from are already usable — for this event only.
Author's summary: Decks for Hearthstone's pre-release Tavern Brawl.