Ob Nixilis, Captive Kingpin #41 from March of the Machine: The Aftermath is a mythic card that currently sells for about $84.76 ungraded, with graded copies ranging from $23.50 at grade 9 to $26.00 at grade 9.5. A grade 9.5 copy sells for around $26.00 vs $84.76 raw. That's a modest premium, so grading only pays off for near-perfect copies.