Diancie-EX #XY43 from XY Black Star Promos is a reverse holo promo card that currently sells for about $8.99 ungraded, with graded copies ranging from $44.00 at grade 9 to $180 at grade 10. A grade 10 copy sells for around $180, about 20× the $8.99 raw price, so high-grade copies are worth grading.