This is the mystery of magic and its forces, regarding which the Sages say, “They repudiate the Divine Agencies in a variety of ways by denying the simple forces of nature (Chullin 7b).” Therefore, the Torah saw fit to prohibit them in order to conduct the world according to plain natural law, as is the will of the Creator.

This is also the reason for the prohibition of “Mixed Fibers,” for via the mixing of fibers they [the magicians] will do strange acts, which will lead to changes in the customary functioning of the world, for better or for worse; aside from that, they themselves constitute alterations in Creation (Deuteronomy 18:9).”