all lv x pokemon cards I finally finished my Lv.X collection! : r/PokemonTCG Perfect for collectors and enthusiasts. Snorlax Lv.X - Rising Rivals

Here are some Pokmon selling sites to start with: 1

With Pokemon cards continued rise in popularity, the prototype could fetch an even higher price.

The main takeaway is this: SPE cards are really valuable, MAR reprints are mostly good, while Marvels Spider-Man (SPM) is just okay in value, outside of a few rares and mythics

And make sure you are dealing with reputable sellers.

Common things one can do with Trainer cards are healing their pokemon, giving them a buff that increases their damage, or alters the field of battle to give one a specific advantage (like with Stadium cards)

Open a pack and you get some cards