After Cryptozoic stopped producing the World of Warcraft Trading Card Game -- and around the time Blizzard announced Hearthstone -- the company turned its attentions to its own digital card game, Hex: Shards of Fate. Hex wound up with $2.2 million in Kickstarter funding and is currently in alpha testing. But the game's success hasn't been missed by the biggest player in TCGs, and Wizards of the Coast has sued Cryptozoic for willfully infringing on its intellectual property -- which is to say Magic: The Gathering. Wizards accuses Cryptozoic of copying cards, plot, elements, circumstances, theme, mood, creatures, pace, play sequence, and flow from Magic.
Hex is markedly similar to Magic -- though many trading card games draw their inspiration from that base -- and even the community has commented on it. In fact, the body of the lawsuit copies substantial material from a blog post on Threshold: The Hex Podcast comparing the two games as well as quoting forum posts in which commenters have noted the same. If this seems like a weak source of evidence to you, then you're in agreement with Cryptozoic, which has come out stating that the lawsuit is meritless and it intends to fight.
If Wizards wins this round, we have to wonder what it means for other card games like our recent favorite Hearthstone.