Team Rocket's Mewtwo ex #079 from Ascended Heroes is a holo rare card that currently sells for about $1.80 ungraded, with graded copies ranging from $12.50 at grade 7 to $71.01 at grade 10. A grade 10 copy sells for around $71.01, about 40× the $1.80 raw price, so high-grade copies are worth grading.