Mordenkainen #283 from Adventures in the Forgotten Realms is a full art / borderless mythic card that currently sells for about $1.36 ungraded, with graded copies ranging from $19.00 at grade 9 to $21.00 at grade 9.5. A grade 9.5 copy sells for around $21.00, about 15× the $1.36 raw price, so high-grade copies are worth grading.