Exodus 7:11 Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments. 12 For they cast down every man his rod, and they became serpents: but Aaron's rod swallowed up their rods
[Patriarchs & Prophets pp 264] The magicians did not really cause their rods to become serpents; but by magic, aided by the great deceiver, they were able to produce this appearance. It was beyond the power of Satan to change the rods to living serpents. The prince of evil, though possessing all the wisdom and might of an angel fallen, has not power to create, or to give life; this is the prerogative of God alone. But all that was in Satan's power to do, he did; he produced a counterfeit. To human sight the rods were changed to serpents. Such they were believed to be by Pharaoh and his court.
There was nothing in their appearance to distinguish them from the serpent produced by Moses. Though the Lord caused the real serpent to swallow up the spurious ones, yet even this was regarded by Pharaoh, not as a work of God's power, but as the result of a kind of magic superior to that of his servants. Pharaoh desired to justify his stubbornness in resisting the divine command, and hence he was seeking some pretext for disregarding the miracles that God had wrought through Moses.
Satan gave him just what he wanted. By the work that he wrought through the magicians he made it appear to the Egyptians that Moses and Aaron were only magicians and sorcerers, and that the message they brought could not claim respect as coming from a superior being. Thus Satan's counterfeit accomplished its purpose of emboldening the Egyptians in their rebellion and causing Pharaoh to harden his heart against conviction.
Exodus 7:13 And he hardened Pharaoh's heart, that he hearkened not unto them; as the Lord had said. 14 And the Lord said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.
May God add His blessing to the study of His word. “Good night” and God bless!