Raichu #DP21 from DP Black Star Promos is a reverse holo promo card that currently sells for about $8.50 ungraded, with graded copies ranging from $16.00 at grade 7 to $900 at grade 10. A grade 10 copy sells for around $900, about 106× the $8.50 raw price, so high-grade copies are worth grading.