After a rough stretch, billionaire Steve Cohen is holding a hot hand.

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One of the most powerful but little-known people in the state Legislature is joining the ranks of the sprawling and highly-compensated team behind the Mets owner’s casino bid, Playbook is first to report.

And the move gives Cohen another in with state Senate leadership after losing the support of Jessica Ramos, whose backing is critical for his quest to build a high-end gaming facility with a hotel, concert venue and a park next to Citi Field.

Eric Katz, who served as lead counsel to the state Senate majority for the past three years — one of the highest non-elected positions in the Legislature — is joining Cohen’s Metropolitan Park as its general counsel, a spokesperson for the company confirmed.