Sheoldred, the Apocalypse #290 from Dominaria United is a showcase mythic card that currently sells for about $96.94 ungraded, with graded copies ranging from $48.42 at grade 7 to $78.69 at grade 10. A grade 10 copy sells for around $78.69 vs $96.94 raw. That's a modest premium, so grading only pays off for near-perfect copies.