Ulamog, the Ceaseless Hunger #1059 from Commander Masters is a full art foil / borderless mythic card that currently sells for about $48.00 ungraded, with graded copies ranging from $43.00 at grade 9 to $91.00 at grade 10. A grade 10 copy sells for around $91.00 vs $48.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.