Black Kyurem-EX #BW62 from BW Black Star Promos is a reverse holo promo card that currently sells for about $4.04 ungraded, with graded copies ranging from $18.77 at grade 7 to $400 at grade 10. A grade 10 copy sells for around $400, about 99× the $4.04 raw price, so high-grade copies are worth grading.