Rocket's Mewtwo #14 from Gym Challenge is a 1st edition holo holo_rare card that currently sells for about $590 ungraded, with graded copies ranging from $836 at grade 7 to $15,600 at grade 10. A grade 10 copy sells for around $15,600, about 26× the $590 raw price, so high-grade copies are worth grading.