Thundurus #50 from Legendary Treasures is a reverse holo holo_rare card that currently sells for about $2.01 ungraded, with graded copies ranging from $12.45 at grade 7 to $81.00 at grade 10. A grade 10 copy sells for around $81.00, about 40× the $2.01 raw price, so high-grade copies are worth grading.