The CCG Shadowverse [Free] has been slowly but steadily gaining steam judging by all the streams I see popping up here and there, and now the game has added its first card expansion called Darkness Evolved. The update adds 109 new cards that open up new possibilities for evolution, which is the game's main claim to fame. These new cards should help keep the game fresh and the fact that they are coming out not too long after the game released globally is a good sign for the game's future. In addition to the new cards, the update also adds Spectator mode, the ability to invite friends to private matches, and much more.
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If you haven't played the game yet, Shadowverse is a story-based CCG that has distinct art (for better or worse) and some fun ideas like evolving cards mid-play and using Amulet cards that can't attack or be attacked but have effects that last until the Amulet is removed from play. If you haven't checked out the game yet, maybe now is a good time to do so.