Darkrai #DP52 from DP Black Star Promos is a reverse holo promo card that currently sells for about $14.58 ungraded, with graded copies ranging from $16.00 at grade 7 to $139 at grade 10. A grade 10 copy sells for around $139, about 9.5× the $14.58 raw price, so high-grade copies are worth grading.