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Its limited availability through GameStop makes it harder to find in mint condition

Perhaps even a combination of those, with foil treatment extended art cards a possibility, for example

5 - Wan Shi Tong, Librarian - $54 Wan Shi Tong, Librarian can rack up counters, has Flash, Flying, and Vigilance, and gives you card draw, too

55/82 Eevee

notably, it's able to achieve the difficult feat of wearing down Snorlax, one of the premier defensive Pokmon in RBY, while Persian's Slash fails to deal damage anywhere close to half of Snorlax's HP

I like it best in green decks that ramp out a bunch of 5+ cost threats, at which point Ugin lays waste to everything else (the ramp also helps play Ugin at a reasonable time)