https://www.gamespot.com/articles/hearthstones-days-of-the-frozen-throne-event-to-of/1100-6461710/

As the weather starts to turn chilly, Hearthstone is offering a special bundle and in-game events to match. Next week Blizzard will kick off the "Days of the Frozen Throne" event, featuring a new Tavern Brawl, new quests and loot, and a specially priced bundle.

The event celebrates the Knights of the Frozen Throne expansion, which launched in August 2017. That expansion was the first to introduce the new Hero card type, in the form of nine distinct Death Knights. If you're still missing some Death Knights, you can pick up a "Bundle Up Bundle" next week that will offer 30 Frozen Throne packs for $20. That's roughly double the usual packs at that price, but keep in mind that those cards will rotate out of Standard play next spring when the new year launches.