A bloodthirsty gangbanger slashed two Rikers Island correction officers in a gruesome ceramic scalpel attack — bringing his behind-bars trail of victims to more than 50 people, union leaders said Thursday.

Sickening photos showed where inmate Sundance Oliver — a 30-year-old accused killer and “ one-man crime wave ” since he was a pre-teen — allegedly slashed one officer’s scalp and another’s face on Wednesday, officials said.

The attack unfolded after Oliver started a fire in his cell in Rikers’ North Infirmary Command, where inmates in involuntary protective custody are housed, around 4:10 p.m., Department of Correction officials said.

The two correction officers had been working to evacuate the smoke-filled housing unit when Oliver pounced with a ceramic scalpel, officials and union

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