Magic is typically forbidden to Israel for a number of reasons: (1) Magic is human encroachment into the divine realm. (2) Magic is used to manipulate deity. (3) Magic involves relying on a power other than Yahweh. If that is the reason, a sanctioned prophet would be able to bypass all three; his office already enters the divine realm, and the power comes from Yahweh, even though the prophet appears to have some autonomy in using it. The prophets are called to wield divine authority at some level.