A Mediocre Person

I am floating in heaven and earth, like duckweed in the vast sea. From birth to death for more than a hundred years, a wisp of green smoke spread across the world, a mere mortal, just a mediocre person. That's right, I'm just a mediocre person. But I, a mediocre person, can fly into the sky and into the earth! You can kill immortals with your sword! What about mortals? There are three living things in heaven, earth, man, and all things, and I only own one of them!