Dialga LV.X #DP37 from DP Black Star Promos is a reverse holo promo card that currently sells for about $15.38 ungraded, with graded copies ranging from $51.00 at grade 7 to $492 at grade 10. A grade 10 copy sells for around $492, about 32× the $15.38 raw price, so high-grade copies are worth grading.