Moltres ex #31 from Nintendo Black Star Promos is a reverse holo promo card that currently sells for about $2.49 ungraded, with graded copies ranging from $8.51 at grade 7 to $45.73 at grade 10. A grade 10 copy sells for around $45.73, about 18× the $2.49 raw price, so high-grade copies are worth grading.