Mew ex #158 from 30th Celebration is a rare card that currently sells for about $700 ungraded, with graded copies ranging from $1,386 at grade 9 to $5,404 at grade 10. TCGrader's AI has graded 4 copies of Mew ex (30th Celebration), averaging 10 overall. 100% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $5,404, about 7.7× the $700 raw price, so high-grade copies are worth grading.