: Buying old adventures (like Curse of Naxxramas ) rewards you with specific, guaranteed cards as you complete the missions .
Yes, you can buy cards, but the process depends on whether you are looking for digital cards to use in-game or physical cards as collectibles. Buying In-Game Digital Cards can you buy hearthstone cards
: If you want a specific card, you don't buy it; you "craft" it using Arcane Dust . You get dust by disenchanting cards you don't want or by receiving it as a reward . : Buying old adventures (like Curse of Naxxramas