Groudon #XY52 from XY Black Star Promos is a reverse holo promo card that currently sells for about $11.50 ungraded, with graded copies ranging from $30.74 at grade 7 to $2,375 at grade 10. A grade 10 copy sells for around $2,375, about 207× the $11.50 raw price, so high-grade copies are worth grading.