Stratus Dancer #80 from Dragons of Tarkir is a foil rare card that currently sells for about $1.39 ungraded and around $3.13 at grade 7. A grade 7 copy sells for around $3.13, about 2.3× the $1.39 raw price, so high-grade copies are worth grading.
Price by Grade
Recent market prices for graded copies of Stratus Dancer
Grade
Market Price
vs Raw
7
$3.13
2.3×
Raw (ungraded)
$1.39
1×
Worth grading? A grade 7 copy sells for around $3.13, about 2.3× the $1.39 raw price, so high-grade copies are worth grading.