Among the hundreds of cards in the set, a select few have risen to prominence as the most expensive and sought-after, driven by their rarity, artwork, and popularity of the featured Pokmon
Vampire Lord X DARK Level 5 [ Zombie / Effect ] ATK 2000 DEF 1500 If this card inflicts battle damage to your opponent: Declare 1 card type (Monster, Spell, or Trap)
Although many people collect Pokemon cards to resell them for thousands of dollars, there is a robust competitive scene as well
When Synchro Summoned, Quariongandrax banishes 3 monsters from your opponent's field or GY (more if you use more than 2 Tuners)
For your most valuable holos and reverse holos, consider rigid toploaders or magnetic cases
(As I am a huge fans of +1/+1 counters, most large sets that I lead design tend to fall in this category.) A recent non-+1/+1 counter block was Champions of Kamigawa