Its really important, where possible, to keep these things in mind
You'll be able to value cards based on the card rarity, distributor, collector number, special symbols, and more
Outside of the cards pricey enough to be officially graded and sealed inside a fancy case by the likes of PSA, looking for less top-dollar cards (look, Im not Post Malone) comes with the constant risk of stumping up the cash for something that either doesnt arrive at all, arrives in a condition different to what you were expecting or turns out to be a complete fake
Jumbo XL Pokmon cards from before 2019 measure 145mm x 200mm (5.7 x 7.9)
(10/13/2023) If the spell had an X value chosen for it as it was cast, the copies will have the same value of X
Depending on how long the last one of those was printed, the prices on those will fluctuate and right now are 0.75 and 0.99 respectively