Niv-Mizzet, Parun #207 from Ravnica Remastered is a rare card that currently sells for about $807 ungraded, with graded copies ranging from $600 at grade 9 to $1,200 at grade 10. A grade 10 copy sells for around $1,200 vs $807 raw. That's a modest premium, so grading only pays off for near-perfect copies.