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
The Vulnerabilities: Authenticity hinges on microscopic data points: print quality, holo consistency, surface texture, font spacing, and core card stock
People opening packs of cards will likely get many duplicates of these rarities if hunting for the Enchanted or even Legendary types
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