Mega Diancie ex #41 from Phantasmal Flames is a rare card that currently sells for about $1.68 ungraded, with graded copies ranging from $11.50 at grade 9 to $42.00 at grade 10. A grade 10 copy sells for around $42.00, about 25× the $1.68 raw price, so high-grade copies are worth grading.