Houndoom #SWSH090 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $10.60 ungraded, with graded copies ranging from $23.10 at grade 9 to $85.00 at grade 10. A grade 10 copy sells for around $85.00, about 8× the $10.60 raw price, so high-grade copies are worth grading.