Yveltal-EX #XY150 from XY Black Star Promos is a reverse holo promo card that currently sells for about $9.88 ungraded, with graded copies ranging from $13.50 at grade 7 to $605 at grade 10. A grade 10 copy sells for around $605, about 61× the $9.88 raw price, so high-grade copies are worth grading.