Mewtwo-EX #XY125 from XY Black Star Promos is a reverse holo promo card that currently sells for about $74.90 ungraded, with graded copies ranging from $130 at grade 7 to $14,499 at grade 10. A grade 10 copy sells for around $14,499, about 194× the $74.90 raw price, so high-grade copies are worth grading.