Its up to you to read through the card checklist of each expansion set to learn if it contains cards that personally appeal to you, but here are a few features to look out for during your booster box research: GX Pokmon cards
With 13 mana lying around you can destroy two things
If you need a huge discount to afford this card, HP copies sell for as little as $35.
Third-party brand names, including Pokmon, are used solely to identify product compatibility
As a beginner seller, or someone who just wants to quickly offload a collection, eBay or Mercari may be your best bet, but it still doesnt hurt to be cautionary about listing upsells
From a business side of things, this helps sell packs and decks