Managing something like this at a competitive level would be horrific but, given that cards that have to be banned keep getting printed, maybe its best to just accept that things dont always need to be competitive to be entertaining
The best checker starts with a clear card photo, identifies the Pokemon, set number, rarity, edition, language, and condition, then compares recent sold prices rather than active listings only
The black star next to its name makes this card extra special
It might always be right there behind you (flash), and once it's there, it'll be unrelenting in its strikes (double strike)
Prepared Energy cards for 9 different types of energy, plus a blank energy card for you to add your own
These happened because both games used some of the same printing facilities in the late 1990s and early 2000s