Gastly #XY132 from XY Black Star Promos is a reverse holo promo card that currently sells for about $5.00 ungraded, with graded copies ranging from $5.00 at grade 7 to $74.47 at grade 10. A grade 10 copy sells for around $74.47, about 15× the $5.00 raw price, so high-grade copies are worth grading.