Gholdengo ex #231 from Paradox Rift is a ultra_rare card that currently sells for about $8.12 ungraded, with graded copies ranging from $11.13 at grade 7 to $55.00 at grade 10. A grade 10 copy sells for around $55.00, about 6.8× the $8.12 raw price, so high-grade copies are worth grading.