Morophon, the Boundless #1 from Modern Horizons is a mythic card that currently sells for about $7.94 ungraded, with graded copies ranging from $1.06 at grade 7 to $8.00 at grade 9.5. A grade 9.5 copy sells for around $8.00 vs $7.94 raw. That's a modest premium, so grading only pays off for near-perfect copies.