Mantyke #189 from Paradox Rift is a holo illustration_rare card that currently sells for about $33.73 ungraded, with graded copies ranging from $22.00 at grade 7 to $30.00 at grade 10. A grade 10 copy sells for around $30.00 vs $33.73 raw. That's a modest premium, so grading only pays off for near-perfect copies.