What CoD "Deathstreak" is only featured in Call of Duty : Modern Warfare 2?

The deathstreak "Copycat" is only featured in Call of Duty: Modern Warfare 2. This deathstreak allows the player to copy the class of the last person who killed them, gaining access to their perks and weapon loadout for a limited time. It provides the player an opportunity to counter their opponent's loadout and potentially turn the tide of the battle by utilizing the enemy's own setup against them.