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They can also be defender creatures that, when a certain condition is met, can attack

The closest I could find to anybody doing it in the mainstream recently was Artifact (I know, I know, I'm stretching the word "mainstream" here) with a slightly bastardised version of the concept handled via Steam's marketplace, and even then it's still an online auction house, not just doing fun swaps with your pals and saying "well I've got this, what've you got?", like exchanging the best parts of your packed lunches at school

While they know they can sell some of the items, they've also opened a few of the boxes

We're celebrating their phenomenal work with the set's art cards