Rocket's Mewtwo #14 from Gym Challenge is a 1st edition holo holo_rare card that currently sells for about $308 ungraded, with graded copies ranging from $308 at grade 7 to $6,500 at grade 10. A grade 10 copy sells for around $6,500, about 21× the $308 raw price, so high-grade copies are worth grading.