Grim Flayer #184 from Eldritch Moon is a mythic card that currently sells for about $0.42 ungraded and around $10.54 at grade 7. A grade 7 copy sells for around $10.54, about 25× the $0.42 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Grim Flayer
Grade
Market Price
vs Raw
7
$10.54
25×
Raw (ungraded)
$0.42
1×
Worth grading? A grade 7 copy sells for around $10.54, about 25× the $0.42 raw price, so high-grade copies are worth grading.