Mewtwo δ #12 from Delta Species is a holo holo_rare card that currently sells for about $242 ungraded, with graded copies ranging from $575 at grade 7 to $18,211 at grade 10. TCGrader's AI has graded 6 copies of Mewtwo δ (Delta Species), averaging 7.5 overall. 33% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $18,211, about 75× the $242 raw price, so high-grade copies are worth grading.