Been done before for sure. I recommend adding some more to this, because at this point the idea seems to be more of an entry on the log of anomalous items than an SCP object that would merit special Foundation containment.
Also, in general, "thing that does a thing" rarely works out these days as the formula is overused. To quote vezaz, "Get away from "type of object" or "sort of creature" and instead start thinking about stories you want to tell. Start looking for moments in your everyday life that give you pause, that are unusual, or that make you go off into a daydream. Then think about bringing the reader to that same moment."
Some aspects people like to add into the SCP to give the reader more to think about include answers to questions like
- Did this object ever have a greater significance before it was contained?
- Was it ever special to someone? Was someone ever special to it?
- How was it initially discovered by the person who first owned it?
- Why does it exist? Does it have a purpose?
- What might the intentions of the creator have been?
- How does it interact with others? Is it meant to do so that way?
