Wicked Wife (1981)

Original title: 邪妻

At first there's a trail of mysterious killing by a girl who seems able to turn into a tiger, then there's a wizard who uses as weapon some poisonous centipedes. The victims must be immediately buried or, as the wizard says, "they return as ghosts". Then a multitude of subplots including a whorehouse, body doubles, some martial arts fighting and a song...