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Like most Magic: The Gathering cards, the value of Laboratory Maniac depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Innistrad Remastered)

When Cauldron Familiar enters, each opponent loses 1 life and you gain 1 life

While it only has 21 lands, it has a massive 16 nonland mana producers, including Utopia Sprawl, Birds of Paradise, Arbor Elf, and Garruk Wildspeaker

I doubt it was officially sold due to the imperfect design but some people like their gold bars to be unique

The difference representing old designs being reprinted into new sets is ~1,100 cards