Act 31 - Infinity 5, Sailor Pluto, Setsuna Meiou (manga and Crystal)
In the manga, she used it against the Sailor Guardians but the affects were unknown because Sailor Jupiter countered it with her own attack.
The attack against Sailor Jupiter in the musical Mugen Gakuen - Mistress Labyrinth and its revision.
In the episode 32 she uses against the Inner Sailor Guardians but fails.
Mandragora or mandrake is a type of plant that appears in folklore.
Though Mandragora Buster never appeared in the anime, it was mentioned in Sailor Moon S Nakayoshi Anime Album 2.