Canyon Slough #239 from Amonkhet is a foil rare card that currently sells for about $1.00 ungraded and around $7.99 at grade 7. A grade 7 copy sells for around $7.99, about 8× the $1.00 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Canyon Slough
Grade
Market Price
vs Raw
7
$7.99
8×
Raw (ungraded)
$1.00
1×
Worth grading? A grade 7 copy sells for around $7.99, about 8× the $1.00 raw price, so high-grade copies are worth grading.