TCGrader's AI has graded 24 copies of Ash-Greninja-EX (XY Black Star Promos), averaging 7.8 overall. Only 17% scored 9 or higher, so genuinely mint copies of this card are scarce. A grade 10 copy sells for around $4,905, about 210× the $23.39 raw price, so high-grade copies are worth grading.