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There is no limit on how many cases a person can find. However, you can use this to your advantage by informing the court of his history of filing fraudulent and unfounded suits. It could irritate the judge and help your cause.
You can raise malicious prosecution and abuse of process as a defense in your response to the complaint filed against you.
Because this is not an attorney, you can't file a bar complaint. The best thing to do is bring this to the court's attention.
The court can't prevent the person from filing, but it can fine/jail the person for filing frivilolus lawsuits.