Mystic onix?

[wilkinsfarm2020]

So I got 5 BCM black chicks at tsc for .50 but one did not have feathered legs. Now I'm wondering if this one was actually a mystic onix instead! What yall think!?

 

[Rock17]

Could be a black star.

 

[wrathsfarm]

Mystic Onyx should have 5 toes. Not good at breed help but yours looks blue.
I agree with you that's it's probably not a Black Copper Marans but that's because of the feather color not the leg feathering. It's not unheard of for Marans to lack leg feathers especially coming from a hatchery. Most hatcheries here in the states do strive for the Marans French standard but leg feathers can vary from none to heavily feathered depending on parent stock breeding.