Hello, author, Pighead In. Let's take a look at your idea.
Elevator Pitch : So, the starting point. And there's not much anything to say about it because you talk more in the section below but just for saying, I don't feel too much hooked by the pitch.
Central Narrative : The big part. And, I will not deny that, there's pretty interesting material in it. This thing about the urchins, mostly. I would like to know what is the history of this first urchin, of the curse, of why it's like that. I find this weird and interesting enough. But the main problem with this narrative is that you focus on the "everyone had bad luck and many people die" part of the thing, which is pretty cliche (I bet we have already many skips who kill you after causing you bad luck) and not really interesting. Plus, I think that suicide is a thing who is already overused by new members in their ideas, so recommandation : don't use that at all. So, yeah, the story has interesting material but too many flaws for being fully interesting to the readers.
Hook : There's not much anything to say, because I already expressed my thoughts above. And I personally fail to see how it could be humorous or terrifying. Having bad luck, it's sad, but funny or terrifying? I fail to see how.
And that's all for me. No greenlight. The main problem I have with your story is that I'm not a fan of the way you choose to focus on. I would recommand you to focalize more on the story of the urchin, the curse and its link with the sea and, maybe, the link with era of sea piracy (I believe that we see that less often on SCP articles) because it would be a more interesting story, at my opinion. I think you had something with that.
For the rest, I apologize for having finished this crit just now, it was long and I was busy and not motivated at 100%, really sorry. It's all for me, Pighead Out.