Heroic Intervention #188 from Core Set 2021 is a rare card that currently sells for about $13.33 ungraded, with graded copies ranging from $13.50 at grade 9 to $15.00 at grade 9.5. A grade 9.5 copy sells for around $15.00 vs $13.33 raw. That's a modest premium, so grading only pays off for near-perfect copies.