Nature isn't commonly held to work in mysterious ways; it's generally held that nature is knowable. Being able to travel faster than light, or send messages fa

Nature isn't commonly held to work in mysterious ways; it's generally held that nature is knowable. Being able to travel faster than light, or send messages faster than light, would not involve objects popping in and out of existence. That's not even a particularly well-formed concept. You and everything else you know are already moving through time and space, and the rules for how that happens also suggest that if you bend the geometry of the universe sufficiently, you can move to a place in less time than it would take for light to cross it. If you then return, you can end up arriving at your origin before you left it. Relativity does not allow the universe to spontaneously warp itself into the kind of pretzel which would allow for things to travel instantaneously back in time, and if it did, the effects on anything else nearby would likely be catastrophic beyond ready imagination. Much of your speculation is rooted in misunderstanding. It's more difficult to explain things because your conceptions don't map well to the actual physics. There's a series on YouTube by PBS called Space Time, which I would strongly recommend as an accessible guide to relativity and physics in general.