Hydreigon #SWSH037 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $7.70 ungraded, with graded copies ranging from $11.00 at grade 9 to $99.99 at grade 10. A grade 10 copy sells for around $99.99, about 13× the $7.70 raw price, so high-grade copies are worth grading.