Press space to add a new "clone". As the title says, this is a list cloner, so it does not use actual clones. Now, theoretically you can have infinite clones (or until your list limit maxes out, if there is such a thing. I haven't looked though the source code of the Scratch editor, but I'm pretty sure it's either 2bil or 4bil).
This was an example for Cubby208 to show how to avoid using clones. For some reason, it keeps running into the wall and is stuck there, I have no idea why. Maybe I'll fix it, I don't know. But aside from that it works. This is theoretical, so it might (and probably) won't work as well as cloning. Like all my projects, feel free to take any scripts into your backpack that you want!