How can a Torah observant Jew perform (including fake) a Magic Show — or even attend one?
Rambam, Hilchos Avodas Kochavim 11:9 and 11:15, writes that it is prohibited to perform acts that appear magical even though there is no actual magic involved. Rambam, Sefer HaMitzvos no. 32, specifically includes acts of sleight of hand in this prohibition.
Chochmas Adom 89:6, rules that acts that appear to be magical are prohibited, even if they are acts of sleight of hand. Rav Ovadia Yosef , Yechaveh Da’as 3:68, accepts the Chochmas Adam’s opinion as binding.
I should not that the B’Tzel HaChochma 4:13, paskens that even those who prohibit acts of sleight of hand only prohibit acts of optical illusions. If someone performs acts of sleight of hand by switching two items while the audience is not looking or other similar acts, it is permissible, even according to Chochmas Adam.