Chien-Pao ex #30 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $4.17 ungraded, with graded copies ranging from $19.95 at grade 9 to $53.95 at grade 10. A grade 10 copy sells for around $53.95, about 13× the $4.17 raw price, so high-grade copies are worth grading.