Revavroom ex #216 from Obsidian Flames is a ultra_rare card that currently sells for about $1.89 ungraded, with graded copies ranging from $5.50 at grade 7 to $31.00 at grade 10. A grade 10 copy sells for around $31.00, about 16× the $1.89 raw price, so high-grade copies are worth grading.