Palkia #DP27 from DP Black Star Promos is a reverse holo promo card that currently sells for about $4.34 ungraded, with graded copies ranging from $29.31 at grade 7 to $500 at grade 10. A grade 10 copy sells for around $500, about 115× the $4.34 raw price, so high-grade copies are worth grading.