Mewtwo ex #157 from 30th Celebration is a rare card that currently sells for about $38.84 ungraded, with graded copies ranging from $82.00 at grade 9 to $65.00 at grade 10. TCGrader's AI has graded 33 copies of Mewtwo ex (30th Celebration), averaging 9.1 overall. 88% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $65.00 vs $38.84 raw. That's a modest premium, so grading only pays off for near-perfect copies.