Sylvan Library #187 from Eternal Masters is a foil rare card that currently sells for about $26.38 ungraded, with graded copies ranging from $10.52 at grade 9 to $12.00 at grade 9.5. A grade 9.5 copy sells for around $12.00 vs $26.38 raw. That's a modest premium, so grading only pays off for near-perfect copies.