GamesIndustry.biz said:

A marketplace on its own may create the potential for an interesting in-game economy, but it sounds as though Artifact all but requires a constant cash flow from its participants. At launch, there is no way to earn packs through play, and in fact there is no single-player campaign, ranking system, or really anything to Artifact other than playing the game with someone else for fun. Barnett clarified that these features may come later depending on what the community wants, but for now the team was only focused on releasing the core of Artifiact - something he'd repeat multiple times throughout our interview, including when asked about cross-platform play with the game's mobile version.