Hearthstone cards represents a character, ability or an effect, like magic spells, which can be used during the match. It is a collectible card game that two players can play, and is operated through Blizzard Entertainments gaming service, Battle.net. Players start with a basic collection of cards but can earn rarer and powerful cards as the game progresses.

This is the first expansion pack to the game and it adds 123 new cards. More cards will be added in future expansions.