It’s a trading card game, the mechanics are very similar to how Pokemon cards worked or Yugioh, but I assume it is because they were based off it.
Never was into it but knew kids who were. Seemed harmless.
His former roomates strenuously tried to get us to give them his card collection, which tells me it is valuable.
>>Seemed harmless.
Except that they require constant investment to stay competitive. Cooperative RPGs that you could play forever with 3 books and some dice were at the height of popularity when the CCGs were invented.