Kyogre-EX #XY41 from XY Black Star Promos is a reverse holo promo card that currently sells for about $5.74 ungraded, with graded copies ranging from $25.45 at grade 7 to $400 at grade 10. A grade 10 copy sells for around $400, about 70× the $5.74 raw price, so high-grade copies are worth grading.