Crucible of the Spirit Dragon #167 from Fate Reforged is a rare card that currently sells for about $5.55 ungraded, with graded copies ranging from $2.94 at grade 7 to $9.99 at grade 8. A grade 8 copy sells for around $9.99 vs $5.55 raw. That's a modest premium, so grading only pays off for near-perfect copies.