Cultivator Colossus #386 from Innistrad: Crimson Vow is a extended art mythic card that currently sells for about $6.25 ungraded, with graded copies ranging from $8.73 at grade 9 to $10.00 at grade 9.5. A grade 9.5 copy sells for around $10.00 vs $6.25 raw. That's a modest premium, so grading only pays off for near-perfect copies.