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The Princess Bride Im honestly surprised it took so long for a Princess Bride Secret Lair to come along

Magic: The Gatherings upcoming crossover with television series Doctor Who will feature legendary cards based on every single Doctor

A second test which could be done is testing the weight of the card as shown below

7 Ethans Ho-Oh: Destined Rivals (Hyper Rare) $30.67 The First Rival While Destined Rivals boasts some of the most recent Hyper Rare cards, this also means it's the most susceptible to price drops once the hype dies down

Cards graded by a professional grading service can often command higher prices

It either slows down your opponents or speeds you up