A genuine Base Set card reads "1995, 96, 98, 99 Nintendo, Creatures, GAMEFREAK." Fakes often get a year or the capitalization wrong
In the Pokmon video games, pseudo-Legendary Pokmon are notable for their immense power
Conflicting Deckbuilding Restrictions Some players may worry that Dark Confidant may be far too powerful for Standard
Every creature in the deck is a rat or makes a Rat token, and many of the cards in the deck have effects that make all of your rats better
Powerful Trainers Cards leaving the format While these cards rotating out wont have the same kind of impact as the other cards higher up on this list, they will still remove some interesting strategy options for many players
Plus, it's a rather expensive hobby (all card games are)