Whether you’re a long-time trading card collector or just beginning your journey, one of the most important questions you’ll face is: How do I protect and store my cards properly? Trading cards, whether they’re Pokémon, Magic: The Gathering, Yu-Gi-Oh!, sports cards, or vintage rarities, hold both sentimental and monetary value. But no matter how rare or expensive a card is, its value can drop dramatically if it becomes creased, scratched, or faded.