Revavroom ex #224 from Obsidian Flames is a holo illustration_rare card that currently sells for about $5.78 ungraded, with graded copies ranging from $8.50 at grade 7 to $94.00 at grade 10. A grade 10 copy sells for around $94.00, about 16× the $5.78 raw price, so high-grade copies are worth grading.