Skyline Cascade #246 from Battle for Zendikar is a common card that currently sells for about $0.50 ungraded and around $2.99 at grade 7. A grade 7 copy sells for around $2.99, about 6× the $0.50 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Skyline Cascade
Grade
Market Price
vs Raw
7
$2.99
6×
Raw (ungraded)
$0.50
1×
Worth grading? A grade 7 copy sells for around $2.99, about 6× the $0.50 raw price, so high-grade copies are worth grading.