Professor Cozmo's Discovery #10 from EX Trainer Kit 2 Plusle is a reverse holo common card that currently sells for about $0.99 ungraded, with graded copies ranging from $17.59 at grade 9 to $52.22 at grade 10. A grade 10 copy sells for around $52.22, about 53× the $0.99 raw price, so high-grade copies are worth grading.