It can enter the battlefield as an absolutely massive flier that also hates on graveyard decks, but as it is neither a human nor a card that interacts with the monarch in any way, I think this is another card that you end up cutting to make the deck more synergistic
I think thet will be specifically because these packs have Gengar and Mewtwo, and we all know how much of a boner white dudes born in the 90's get over LE EPIC GEN 1 Pokemon
Kaito, Cunning Infiltrator has a few things going on for it, notably that you can give a creature unblockable and profit from your creatures hitting your opponents
CE Listed
Prices overall will vary depending on which version youre interested in though
A more recent set, Prismatic Evolutions from January 2025, is even more mind-boggling with a total set value of over $3,700, driven mostly by the Special Illustration Rare Umbreon ex card, which is considered to be worth over $1,000 in the US