Toxrill, the Corrosive #132 from Innistrad: Crimson Vow is a mythic card that currently sells for about $15.97 ungraded, with graded copies ranging from $20.76 at grade 9 to $23.00 at grade 9.5. A grade 9.5 copy sells for around $23.00 vs $15.97 raw. That's a modest premium, so grading only pays off for near-perfect copies.