Marsh Flats #248 from Modern Horizons 2 is a foil rare card that currently sells for about $33.44 ungraded, with graded copies ranging from $18.00 at grade 9 to $37.51 at grade 10. A grade 10 copy sells for around $37.51 vs $33.44 raw. That's a modest premium, so grading only pays off for near-perfect copies.