Help!!! I have no idea what this black rhizomatous begonia is!!

I tried to add photos of it at various angles – there seems to be a slight blue iridescences to the leaves at some angles but it’s not super obvious.

The center of the leaf is bright yellow/green, the back is burgundy, top is black/super dark green, stems/rhizomes are burgundy and the hairs on the stems are STARK white. – and when I repotted her she stained my shears with a “bl**dish” color, and my fingers lol.

I have a couple guesses
– hallows Eve
– black coffee
– bill Morris

Thanks so much for any help in advance!!