Urza, Lord High Artificer #244 from Mystery Booster 2 is a foil mythic card that currently sells for about $276 ungraded, with graded copies ranging from $400 at grade 9 to $440 at grade 9.5. A grade 9.5 copy sells for around $440 vs $276 raw. That's a modest premium, so grading only pays off for near-perfect copies.