Energy Flux #161 from Mystery Booster 2 is a foil uncommon card that currently sells for about $9.95 ungraded, with graded copies ranging from $10.50 at grade 9 to $12.00 at grade 9.5. A grade 9.5 copy sells for around $12.00 vs $9.95 raw. That's a modest premium, so grading only pays off for near-perfect copies.