pokemon card bulbasaur Autographed Vintage 1st Gen Limited Edition – Jason Paige Shop [GG] Leech Seed (20) Heal 10 damage from this Pokmon Bulbasaur Shiny · Celestial Guardians

Black cards commonly reduce the cost of opponents characters or have effects keyed to a characters cost for example, many black effects say KO an opponents character with cost X or less. By lowering an enemys card cost (via an effect like Kuzan from OP-02 that reduces an enemys cost by 4), a black deck can then KO that card with another effect

This historical context gives you a much deeper understanding of a card's place in the market beyond a single snapshot in time

Do you remember playing Red and Blue on your Game Boy in the 90s

Given the lack of hype surrounding the product this card hails from, there are few sales, but the price may change when more copies exchange hands.