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The maths doesn't work on Umbreon #59 from Prismatic Evolutions right now. The gap between the $53.90 raw price and the $78.00 PSA 10 price gives a -46% Return on Grading. Hold it raw and watch for the graded price to move.
Among the 105 cards in Prismatic Evolutions with PSA 10 sale data, Umbreon ranks 74th for Return on Grading and 55th by PSA 10 price. Of the 10 Rare cards with PSA 10 sales, it is 10th for Return on Grading. The median PSA 10 in this set sells for $82.73. 14 of the 105 clear a 100% Return on Grading.