Have a look at them: They are specialized decks of cards, traditionally used for fortune-telling, divination, and self-reflection
Unless the original itself has an anti-counterfeiting device, the item has been appraised by Wizard of the Coast to determine whether it is authentic or counterfeit, or has been exhibited at an authorized auction and has an appraisal certificate (the problem is that even the appraisal certificate can be forged)
Seeing that, Kotori tries in many ways to cheer him up, but it doesn't work, and she even ends up being hospitalized
Look at the top card of your library, and cast it if it's a creature
If you want to read more, I did a deep dive on it, linked below
There are protagonists and antagonists, and many would argue that there's no more repugnant symbol in America than the Klu Klux Klan