Charizard-EX #XY17 from XY Black Star Promos is a reverse holo promo card that currently sells for about $14.02 ungraded, with graded copies ranging from $38.21 at grade 7 to $975 at grade 10. A grade 10 copy sells for around $975, about 70× the $14.02 raw price, so high-grade copies are worth grading.