Volcanion #XY145 from XY Black Star Promos is a reverse holo promo card that currently sells for about $10.99 ungraded, with graded copies ranging from $7.00 at grade 7 to $158 at grade 10. A grade 10 copy sells for around $158, about 14× the $10.99 raw price, so high-grade copies are worth grading.