Staff of Compleation #358 from Phyrexia: All Will Be One is a full art foil / borderless mythic card that currently sells for about $39.88 ungraded, with graded copies ranging from $5.62 at grade 7 to $62.00 at grade 10. A grade 10 copy sells for around $62.00 vs $39.88 raw. That's a modest premium, so grading only pays off for near-perfect copies.