Tradable cards can be dragged into your deck to spend 1 mana and draw a new card from your deck, while Questline cards, similar to Quest ones, are legendary spells that start in your hand, have a condition and along with the reward for meeting the condition. United in Stormwind introduced two new keywords: Tradeable and Questline. Set in the majestic capital city Stormwind, a testament to all the Alliance stands for, United in Stormwind features the Alliance's mercenaries coming to rest, preparing for the next step in their journey, and filled with bustling trade, shiny equipment, epic mounts, and new Questlines. United in Stormwind is Hearthstone's 18th expansion, featuring 135 collectible cards released on August 3, 2021.

Standard format expansions Voyage to the Sunken City

The highlighted sets are in Standard format. The following is the card set release calendar for all expansions and adventures. The following is a table of all expansions, counting all collectible cards and Mini-set cards. Hearthstone's first expansion was Goblins vs Gnomes, released in December 2014. Starting with Knights of the Frozen Throne in August 2017, expansions also featured optional solo-player content in the form of Missions, effectively integrating an adventure into each expansion. In early 2017, the developers announced their plans to release three expansions each year, with each expansion featuring around 130 new cards, abandoning their previous annual release cycle of expansion- adventure-expansion. These expansion cards are obtained chiefly through purchasing and opening card packs, through crafting, or through earning Arena rewards. These cards, referred to as expansion cards, are used primarily to create and build decks to play in Casual or Ranked mode, in either the Standard or Wild game format modes. Expansions introduce the majority of collectible cards into the game, with each expansion introducing around 130-145 new cards.

Expansions are major card set additions to the game of Hearthstone.

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