The Pokmon show and video games have been incredibly popular for decades, and a lot of people find nostalgic value in collecting Pokmon cards
It's also easy to play for free if you use your gold smartly and keep up with daily rewards, even if you are not particularly good
While it would seem that you want this is as one of the 99 (putting it into a Muldrotha, the Gravetide deck, for example) so that you can take advantage of it as a graveyard piece, you can still do that if its your commander
It combines the Japanese setsIncandescent ArcanaandParadigm Trigger, introducing new Radiant Pokmon, Pokmon VSTAR, and VMAX
Misty is arguably the best ramp card available, only held back by the abundance of Pikachu decks that easily counter Water decks