My pro gamer move has been denied
First, I googled how to spawn objects around circle. Which led me to this wonderful threat, if you wanna check out: https://answers.unity.com/questions/1527538/instantiate-prefabs-in-a-circle.html
With the help of that I created a bunch of position datas in circle which I can feed them into Unity's line renderer system. But not yet.
I made another bunch of points with bigger radius but with same exact amount of points. So now I have two imaginary circles made out of points.
What I did next is I ran a for loop to pick a point from inner circle, then from outer, then inner, then outer and so on. Which will result in me having buzzsaw like shape.
Finally I made a little animation code to simulate motion in line renderer.Now here comes the unsolvable problem.
If you look closely at the head part, you'll see it's kinda glitching. That's because in Unity's line renderer system, if two points gets too close to each other, the line will get awkwardly screwed or twisted. And that marks the end of this tiny little coding adventure.