After handling hundreds of Pokmon cards, I have learned that even a tiny difference in card dimensions or exact measurements can affect how cards fit into card sleeves, binder pages, or a deck
This may not sound too strong, but time and time again, one simple mana can be all you need to win a game or comeback from a rough situation, and nearly every Commander deck needs a Command Tower
Cloud, Midgar Mercenary Cloud is interesting as a card in the 99 for decks that play Equipment or as a commander on his own
And Konami loves reprints for accessibility
My actually-competitive deck is this concept in the extreme: the Moltres EX and Charizard EX combo that requires gathering energy with one, and gradually sticking it on the other, until the latter is fully charged and ready to do more guaranteed damage than any other card in the game