Vaporeon-GX #SM172 from SM Black Star Promos is a reverse holo promo card that currently sells for about $10.00 ungraded, with graded copies ranging from $12.56 at grade 7 to $585 at grade 10. A grade 10 copy sells for around $585, about 59× the $10.00 raw price, so high-grade copies are worth grading.