Revavroom ex #216 from Obsidian Flames is a ultra_rare card that currently sells for about $1.28 ungraded, with graded copies ranging from $9.40 at grade 7 to $41.00 at grade 10. A grade 10 copy sells for around $41.00, about 32× the $1.28 raw price, so high-grade copies are worth grading.