Mega Gengar ex #56 from Phantasmal Flames is a holo rare card that currently sells for about $2.95 ungraded, with graded copies ranging from $10.00 at grade 7 to $46.00 at grade 10. TCGrader's AI has graded 5 copies of Mega Gengar ex (Phantasmal Flames), averaging 8.9 overall. 40% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $46.00, about 16× the $2.95 raw price, so high-grade copies are worth grading.