If you want to become the best, separated from other killers, you need to get a killstreak kit and create a weapon with the same name. But if you want to stand out from other killstreakers, then you need to get the rarest variation of the kit - a professional killstreak kit.
Professional killstreak kit TF2 - is an item that allows players to get a unique type of weapon which includes a kill counter, colored sheen, and particle effect to the user's eyes. There are seven different types of effects, these will become visible after at least five kills.
Find a professional killstreak kit for the best prices on DMarket Marketplace to be the best one on the server.