Soul Shatter #345 from Zendikar Rising is a extended art rare card that currently sells for about $8.90 ungraded, with graded copies ranging from $10.01 at grade 9 to $11.00 at grade 9.5. A grade 9.5 copy sells for around $11.00 vs $8.90 raw. That's a modest premium, so grading only pays off for near-perfect copies.