Houndstone ex #162 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $1.37 ungraded, with graded copies ranging from $6.50 at grade 9 to $29.00 at grade 10. A grade 10 copy sells for around $29.00, about 21× the $1.37 raw price, so high-grade copies are worth grading.