Liliana, Death Wielder #275 from Amonkhet is a foil mythic card that currently sells for about $4.05 ungraded and around $12.29 at grade 7. A grade 7 copy sells for around $12.29, about 3× the $4.05 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Liliana, Death Wielder
Grade
Market Price
vs Raw
7
$12.29
3×
Raw (ungraded)
$4.05
1×
Worth grading? A grade 7 copy sells for around $12.29, about 3× the $4.05 raw price, so high-grade copies are worth grading.