Mayoral long-shot candidate Michael Blake is suing the city’s powerful campaign finance agency in a last-ditch bid to be allowed onto the Democratic primary debate stage later this week.

Blake — arguably the breakout star of last week’s first debate — claims the Campaign Finance Board nixed hundreds of valid donations that would have made him eligible for the forum hosted by Spectrum on Thursday night.

“The CFB has acted arbitrarily, capriciously, illegally, and unconstitutionally in doing so,” claims Blake’s Manhattan Supreme Court suit.

The CFB’s “antiquated” database wrongly rejected nearly 200 donations to Blake’s campaign, including one by Public Advocate Jumaane Williams, according to the lawsuit, filed Sunday.

The contributions would have made Blake eligible for the city’s gener

See Full Page