One blade of millions

I've been watching it all
All these punk psychos
Never caring
For their choice of weapon
However
My blade
I never let it rust
I let it decide where to cut
And I never leave it anywhere
After a while It got bored
These harmless flesh bags
So I came up with a better idea
Use my blade on the other killers
I couldn't stop doing it
It became second nature
Cutting
Slicing
Stabbing
Everybody who passed me died
My blade may be just another weapon
But it's what sets me apart from them