The Gitrog Monster #238 from Innistrad Remastered is a foil mythic card that currently sells for about $16.22 ungraded, with graded copies ranging from $39.97 at grade 9 to $29.99 at grade 10. A grade 10 copy sells for around $29.99 vs $16.22 raw. That's a modest premium, so grading only pays off for near-perfect copies.