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Ruination, From the Ashes and to a certain extent Hall of Gemstone altogether cost about $10

Most modern fakes are able to get the weight about right, and in cases where the card is notably lighter than the real deal, you'll almost certainly already have been able to spot the card as a fake via other means, like quality and feel of the material - making weighing a bit surplus to requirements

The card even sees regular play in cEDH, where its Curiosity lines can lead to surprisingly quick kills

Collectors may opt to grade their cards using professional grading companies that will rate them (PSA and Beckett being popular choices) and provide your cards with a permanent rating