For individual cards and older booster packs and boxes, you will just have to gain a lot of experience and learn the nuances of real Pokemon products and then make educated purchases, ideally with a means of recourse if it turns out you were scammed (some kind of buyer protection program, etc)
In the Pokmon Trading Card Game, attacks are often thought of their cost in Energy Attachments or the number of separate instances energy would need to be attached in order to have sufficient energy to use an attack
TCGplayer offers a user-friendly app and price guide that can help you quickly place value to cards and card collections
Summary The Enchanted Elsa card from Disney Lorcana has quickly become highly valuable, selling for $750-$850, even though it doesn't have any unique in-game performance
This new comics collab set will web-sling onto shelves on September 26th
This versatility already cements it as a good green 4-drop for Cubes and a worthy inclusion in green Commander decks