Mudsdale #SM20 from SM Black Star Promos is a reverse holo promo card that currently sells for about $5.46 ungraded, with graded copies ranging from $14.00 at grade 9 to $60.93 at grade 10. A grade 10 copy sells for around $60.93, about 11× the $5.46 raw price, so high-grade copies are worth grading.