Overlord of the Boilerbilges #146 from Duskmourn: House of Horror is a foil mythic card that currently sells for about $59.99 ungraded, with graded copies ranging from $45.00 at grade 9 to $50.00 at grade 9.5. A grade 9.5 copy sells for around $50.00 vs $59.99 raw. That's a modest premium, so grading only pays off for near-perfect copies.