Wingmate Roc #31 from Khans of Tarkir is a foil mythic card that currently sells for about $0.51 ungraded and around $1.42 at grade 7. A grade 7 copy sells for around $1.42, about 2.8× the $0.51 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Wingmate Roc
Grade
Market Price
vs Raw
7
$1.42
2.8×
Raw (ungraded)
$0.51
1×
Worth grading? A grade 7 copy sells for around $1.42, about 2.8× the $0.51 raw price, so high-grade copies are worth grading.