Pikachu-GX #SM232 from SM Black Star Promos is a reverse holo promo card that currently sells for about $11.99 ungraded, with graded copies ranging from $16.83 at grade 7 to $500 at grade 10. A grade 10 copy sells for around $500, about 42× the $11.99 raw price, so high-grade copies are worth grading.