Wooper #155 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $4.29 ungraded, with graded copies ranging from $16.31 at grade 9 to $52.00 at grade 10. A grade 10 copy sells for around $52.00, about 12× the $4.29 raw price, so high-grade copies are worth grading.