Chances are, it is little more than the price a sentence of information about its availability
I think people need to think of these as Clue artifacts that are incredibly cheap to cast (and can be easily recurred with something like Salvaging Station), and just happen to also be Equipment cards that creatures can gear up with
Frogadier has a bright future ahead as the most valuable Art Rare in Ninja Spinner
With how easy it is for Angels to flood the battlefield, Youthful Valkyrie can grow very quickly to become a problem
Its default Psychic Sphere attack deals only 50 damage, but if there's an option to discard two extra Psychic Energy, then it can hit for 150 points of damage instead, using its Psydrive attack
Once you grind through enough leagues with your blitzball team, youll unlock the very powerful Celestial Weapon for Wakka, alongside Wakkas best abilities