Darkrai #XY114 from XY Black Star Promos is a reverse holo promo card that currently sells for about $59.61 ungraded, with graded copies ranging from $87.58 at grade 7 to $8,000 at grade 10. A grade 10 copy sells for around $8,000, about 134× the $59.61 raw price, so high-grade copies are worth grading.