For me, and for so many collectors, its the thrill of cracking open a new booster pack and thumbing through the cards to see that glint of a gold or red-orange symbol
Often, your opponent wont block with it, so you get some extra damage in, but they could ruin your plans if they do block
The most valuable cards from the Delta Species set typically include holographic rare cards, first edition prints, and cards featuring popular Pokemon
I dont know whether Ravensburger knew that, but I think that maybe it comes across in my work
Forty-five cards come in a gilded foil treatment, highlighted by cards like Raffine, Scheming Seer that are a few bucks in their base printing but 10 times more in the illusive gilded foil
That emotional connection to the source material is pretty potent stuff