Gyarados #XY109 from XY Black Star Promos is a reverse holo promo card that currently sells for about $39.99 ungraded, with graded copies ranging from $53.00 at grade 7 to $2,630 at grade 10. A grade 10 copy sells for around $2,630, about 66× the $39.99 raw price, so high-grade copies are worth grading.