Rayquaza-EX #XY73 from XY Black Star Promos is a reverse holo promo card that currently sells for about $12.99 ungraded, with graded copies ranging from $27.00 at grade 7 to $860 at grade 10. A grade 10 copy sells for around $860, about 66× the $12.99 raw price, so high-grade copies are worth grading.