Faerie Mastermind #58 from March of the Machine is a foil rare card that currently sells for about $12.34 ungraded, with graded copies ranging from $19.99 at grade 9 to $22.00 at grade 9.5. A grade 9.5 copy sells for around $22.00 vs $12.34 raw. That's a modest premium, so grading only pays off for near-perfect copies.