Mana Drain #637 from Commander Legends is a extended art foil mythic card that currently sells for about $73.01 ungraded, with graded copies ranging from $50.30 at grade 9 to $55.00 at grade 9.5. A grade 9.5 copy sells for around $55.00 vs $73.01 raw. That's a modest premium, so grading only pays off for near-perfect copies.