So, what you have currently is the "thing that does a thing" or "X that does Y" concept. An SCP article is much more than simply an anomalous item, being, place, or event. The true meat of the SCP is the story around the anomalous thing. The thing itself is a vehicle that the narrative is attached to. To give my best example from Series 1, look at SCP 093: The anomalous item itself is a rock that turns mirrors into interdimensional portals. The thing that makes this SCP shine is the story; the history of the dimension that it leads to.
We need to know more than just "it's slime that duplicates into a humanoid creature when it consumes non-rusting metal alloys." What story are you going to tell - How The Foundation found it, Who or what created it, and why, did someone use it to some end? (These are not all questions that must be answered, these are some possible narrative hooks.)
I also recommend reading several (at least 10-20) of the top-rated SCPs from the last several months, and avoid reading series 1 SCPs for inspiration. Many series 1 SCPs would not last a day under current SCP standards, and a few are only still around because of their history with the wiki itself. (This does not apply to all series 1 SCPs, as you can see I mentioned 093 earlier, but many of these were written before the wiki's style had really been cemented.)
Coming up with a being and attaching anomalous properties to it is just the first step. Attaching a good story, a compelling narrative, something that makes the reader feel something is a much harder goal.
I am not saying this to discourage you, I just want you to understand the amount of effort that goes into creating a successful SCP.
If you can revise this idea with a story that you want to tell, we will be able to give you much more meaningful and constructive critique.
EDIT: I should add, one of our members is actually hosting a seminar this coming Monday (Dec 16, 6pm EST) on Narrative advice for beginners.
