I thought Legends of Runeterra was a pretty fun game for a few weeks, with a good amount of interaction and interesting mechanics.  But when they nerfed several of the cards that I had crafted, my deck became unplayable, and there isn't any kind of dust or wildcard refund, so I felt like the only remedy would have been to spend money and make a new deck.  I'm a fan of aggressive balance changes, but without any compensation, it feels like you're buying/crafting cards that could potentially be useless in a couple of weeks, which is a really bad thing.