How Constant Change Will Keep Hearthstone's New Mode Fresh

Hearthstone's new Twist mode looks to provide a different experience than Standard or Wild--or the defunct Classic--by providing constant new deck-building challenges.
Hearthstone is a free-to-play digital strategy card game where you can choose one of nine epic Warcraft heroes to play as.

Hearthstone – Analysis and Deconstruction

If I save my Standard packs until the new rotation next year, will they contain the current standard cards (last 2 years of expansions) or will they change to contain the new

21.2 Patch Notes — Hearthstone — Blizzard News

Hearthstone's Patch 18.6.1 brings sweeping changes to Duels and Battlegrounds - Dot Esports

Blizzard Hearthstone: Heroes of Warcraft (for iPad) Review

Behind the Scenes With Hearthstone's Death Knight - IGN

Hearthstone's upcoming event features 18 buffed cards, new free Legendary minion - Inven Global

Hearthstone's new format will see old expansions retired from 'Standard' play

Blizzard Hearthstone: Heroes of Warcraft (for iPad) Review