Cornerstone Mask Ogerpon ex #215 from Twilight Masquerade is a holo illustration_rare card that currently sells for about $12.34 ungraded, with graded copies ranging from $9.50 at grade 7 to $64.99 at grade 10. A grade 10 copy sells for around $64.99, about 5.3× the $12.34 raw price, so high-grade copies are worth grading.