I feel like a cooldown and a chance of it not working would be really nice considering it would stop dupers from knifing multiple times in a row on the same account and it might not even work. If we weren't considering duped knives then all it comes down to is luck. If someone was lucky enough they could pull 3 god ranks in a row. The chances are extremely low but it is possible. The knife could use a rework but i see nothing wrong with it as it is.