Shining Cards featuring Shiny versions of Legendary or Mythical Pokmon like Mew or Rayquaza
Its value has skyrocketed due to popularity, rarity, and condition
This was true all the way through Born of the Gods
For collectors who value provenance, event exclusivity, and historical significance over raw aesthetics, Misty's Seadra Prerelease is one of the most compelling cards in either Gym set, and its position near the top of the value chart reflects the premium that the vintage market places on cards with unique origins and limited distribution
Judging by the game's current pace, each expansion seems to introduce only a few new Item Cards, likely because they have the potential to be game-breaking and need to be added carefully
It actually makes me sad to see such a playable format staple with such an unreasonably high price tag