Blizzard announces “freemium” online trading card game

HearthStone: Heroes of Warcraft is Blizzard's first "freemium" model game.

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Mediatization of a card game: Magic: The Gathering, esports, and streaming - Jan Švelch, 2020

Would an online marketplace for in-game items (when players trade items, developers get % of sales) make sense? - Quora

Call of Duty: Mobile' game sees 100 million downloads in first week