Stoneforge Mystic #337 from Double Masters is a full art foil / borderless rare card that currently sells for about $28.14 ungraded, with graded copies ranging from $21.50 at grade 7 to $180 at grade 10. A grade 10 copy sells for around $180, about 6.4× the $28.14 raw price, so high-grade copies are worth grading.