Mewtwo-GX #SM196 from SM Black Star Promos is a reverse holo promo card that currently sells for about $12.55 ungraded, with graded copies ranging from $15.00 at grade 7 to $165 at grade 10. A grade 10 copy sells for around $165, about 13× the $12.55 raw price, so high-grade copies are worth grading.