Bad Astronomy: Searching for Dark Planets

Apparently there is a dark planet out there past pluto that is impossble to see but large enough to alter the tilt of the Sun. So what if we simply use lasers? Beams go out and when they get blocked by something we cant otherwise see, huzzah! We found invisible Planet 9...or is it Planet 10? The point being there are quicker ways to do something other than look at movement of impossibly faint objects in photos. Rotating laser satellite sweeping the most probable path of the invisible planet until it crosses paths with the beam seems obvious. Laser beam mapping will allow us to map oort cloud objects well before we could ever send a probe to do it and we can get the data back in our lifetime.