Traditionally, trading cards are worth oodles on their release day, then drop in value like a brick in just days, if not hours, later
Cards similar to Mischievous Catgeist // Catlike Curiosity include A-Mischievous Catgeist // A-Catlike Curiosity
Emerald, however, is good at keeping your opponent off balance at any point of the game
That makes it a profitable item right now, but the highest selling Charizard without that symbol had an additional perk
The fact that these illustrations feature numerous iconic trainers from the franchise only further adds to their value, as fans will want to get their hands on any card that features their favorite human characters in the franchise
This is what makes cards which say target spell powerful