Throwing a cleaver so hard it cost you some blood...but that's ok, cause if you hit someone with it, you instantly get it back. What, does he have transfusion needles and tubes in all his cleavers?
Barely anything in league is logical.
If you want logical marksmen...
is now immune to all melee damage and can freely move over all terrain. (Because..if you're in a helicopter, why would you ever fight at a low enough level that someone could hit you with a sword?)
Also, better reduce all marksman's movement speeds down to like 30, cause..they're gonna be slow as fk if they have to carry around all that ammo and traps and fuel and extra weapons.
And Sivir can now only use her Q or autoattack..not both...and she has to wait for it to come back to do anything else. Or..if she can't catch her weapon on the return path because she's cc'd or something, she either gets killed (by it cutting her in half) or it drops on the ground and has to go pick it up before she can attack again. Also if she attacks someone like
or full stack
or
or
she just loses her ability to attack forever, as her weapon would either get stuck in them, or destroyed.
Think of mana as a form of energy. It takes effort/aiming for Cait to line up her q and r, it's gonna cause some eye strain, so she can't do it continually without taking a break/able to close her eyes for a minute. (aka: recalling)
Or like Corki, his W could use up some fuel, and he has to go back to base for more fuel.
Use your imagination, cause trying to think of LoL 'realistically' is going to make your head hurt...a lot...