Tezzeret the Seeker #62 from Modern Masters 2015 is a foil mythic card that currently sells for about $23.50 ungraded, with graded copies ranging from $26.00 at grade 9 to $29.00 at grade 9.5. A grade 9.5 copy sells for around $29.00 vs $23.50 raw. That's a modest premium, so grading only pays off for near-perfect copies.