Kyogre #XY51 from XY Black Star Promos is a reverse holo promo card that currently sells for about $7.88 ungraded, with graded copies ranging from $11.28 at grade 7 to $2,500 at grade 10. A grade 10 copy sells for around $2,500, about 317× the $7.88 raw price, so high-grade copies are worth grading.