What if everything exists always, it’s just a matter of time until it becomes reality?

For example, unicorns… 🦄

They don’t exist, but humans could selectively breed a series of generations of horses or Maybe deer until a single horn is formed onto their head, whether it’s a horse growing a hump on its head or a deers horns slowly getting closer and close together until they wrap around or something…

I mean the idea is pretty much possible thanks to 3D printers alone, not the unicorn but what I said in the title.

What I think is strange about this question is that wouldn’t it imply ghosts are real? For example, let’s say a deer was selectively bred into one day become a unicorn, well not let’s say all of those deer unicorns are killed and now extinct, but the deer still exist so you could then again selectively breed those deer into unicorns… I guess it’s the same with like extinct animals coming back thanks to science.