Something fragile that is likely to fail or collapse.
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A structure or situation that looks impressive but is fragile and likely to collapse at any moment.
A house of cards is built on unstable foundations and can come crashing down with the slightest disruption.
It is used to warn that something relies on too many uncertain factors to be sustainable.
"Built on Sand"
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Founded on weak or unreliable foundations that will not support long-term stability
"Smoke and Mirrors"
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Something that looks impressive or real but is actually an illusion designed to deceive
"A House of Cards"
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Something that appears solid but is dangerously fragile and likely to collapse