Revavroom ex #156 from Obsidian Flames is a reverse holo rare card that currently sells for about $1.29 ungraded, with graded copies ranging from $6.00 at grade 7 to $20.00 at grade 10. A grade 10 copy sells for around $20.00, about 16× the $1.29 raw price, so high-grade copies are worth grading.