Mega Gengar ex #284 from Ascended Heroes is a holo illustration_rare card that currently sells for about $819 ungraded, with graded copies ranging from $679 at grade 7 to $1,758 at grade 10. TCGrader's AI has graded 57 copies of Mega Gengar ex (Ascended Heroes), averaging 8.9 overall. 75% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $1,758, about 2.1× the $819 raw price, so high-grade copies are worth grading.