Polyjuice Potion

Enchant creaure.
Enchanted Creature becomes a copy of another target creature on the battlefield.
"'Ooh, you look much tastier than Crabbe and Goyle, Harry' said Hermione, before catching sight of Ron's raised eyebrows, blushing slightly
and saying 'oh you know what I mean -
Goyle's Potion looked like bogies'"