M Diancie-EX #XY44 from XY Black Star Promos is a reverse holo promo card that currently sells for about $90.00 ungraded, with graded copies ranging from $103 at grade 7 to $622 at grade 10. A grade 10 copy sells for around $622, about 6.9× the $90.00 raw price, so high-grade copies are worth grading.