Brightglass Gearhulk #191 from Aetherdrift is a foil mythic card that currently sells for about $5.43 ungraded, with graded copies ranging from $10.20 at grade 9 to $11.00 at grade 9.5. A grade 9.5 copy sells for around $11.00, about 2× the $5.43 raw price, so high-grade copies are worth grading.