Marshadow-GX #156 from Burning Shadows is a holo rare card that currently sells for about $20.00 ungraded, with graded copies ranging from $3.50 at grade 7 to $12.00 at grade 10. A grade 10 copy sells for around $12.00 vs $20.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.