Quaxwell #83 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $1.06 ungraded, with graded copies ranging from $5.63 at grade 9 to $30.00 at grade 10. A grade 10 copy sells for around $30.00, about 28× the $1.06 raw price, so high-grade copies are worth grading.