Thundurus-EX #26 from Roaring Skies is a reverse holo holo_rare card that currently sells for about $2.19 ungraded, with graded copies ranging from $7.50 at grade 7 to $84.00 at grade 10. A grade 10 copy sells for around $84.00, about 38× the $2.19 raw price, so high-grade copies are worth grading.