Fans of Magic: The Gathering and other CCGs will feel right at home here. The mechanics are much the same as other genre entries--attacking, casting spells, summoning, mana pools (which simply increase by 1 each turn, barring any special spells), drawing cards, attacking the other player directly to win the game, and so on. But Blizzard aims to simplify and refine the CCG, much as they did with the MMORPG.
The interface is clean, decks are limited to 30 cards, and the mechanics of each card are simple enough to understand immediately. When both players run out of cards, they take damage each turn until the game is over. Getting into multiplayer games, which are limited to 1-on-1 is as simple as hitting go. There’s also a single-player practice mode, and a mode similar to the ever-popular “draft” CCG format, where you build a deck immediately before the game from a pre-set pool of cards and go against someone else who has just done the same.