Valve's next title Artifact, a trading-card game, will be released November 28th. Digital trading card games like Gwent from Witcher developer CDProjekt Red and Hearthstone from Blizzard have been doing surprisingly well lately. That's probably somewhat because they're free to play. Artifact, based on Valve's free-to-play MOBA, Dota 2 will not be. Instead, a pair of 54-card starter decks and ten 12-card booster packs will set you back $20, according to Ars Technica.