I haven't even tried to get into this fantasy but, I find so many or something critically wrong about it.

I don't know how this fantasy might go,
Either you get to take yourself alone to the times past or you take other ls as well but, either way it comes, there is always goi g to be a balance offset
I can tell you certainly that, every moned coin is owned by someone. Either bought by an investor or it stays hodl away by miners.
There isn't going to be any supernatural mining to fill your desire and investors of time past aren't going to stop investing either. Perhaps there would be a price jump as to more demands to get your chance. Either way, you might not buy enough or perhaps, your future self won't be so convincing of your past self.