Dialga #DP49 from DP Black Star Promos is a reverse holo promo card that currently sells for about $9.15 ungraded, with graded copies ranging from $29.48 at grade 7 to $3,617 at grade 10. A grade 10 copy sells for around $3,617, about 395× the $9.15 raw price, so high-grade copies are worth grading.