Cornerstone Mask Ogerpon ex #58 from Prismatic Evolutions is a holo rare card that currently sells for about $1.32 ungraded, with graded copies ranging from $12.24 at grade 9 to $50.00 at grade 10. A grade 10 copy sells for around $50.00, about 38× the $1.32 raw price, so high-grade copies are worth grading.