G-d commanded Moses and Aaron to take the Jews out of Egypt, promising them “signs and wonders” to accomplish this great task.
The first three miracles performed by Moses and Aaron to intimidate Pharaoh (turning a staff into a snake and the plagues of blood and frogs) were duplicated by the magicians. G-d could have chosen any signs He wanted for Moses and Aaron to perform in order to imbue Pharaoh and the Egyptians with fear and awe of Him. Yet He specifically chose signs that could be replicated by Pharaoh’s magicians. Why might G-d have used signs that Pharaoh’s magicians could perform, rather than ones beyond their abilities?
Rashi writes that when G-d instructed Moses and Aaron to approach Pharaoh to demand the release of the Jewish people, He commanded them to speak respectfully to Pharaoh and to give him the honor to which a king is entitled (Shemot 6:13). As Pharaoh was among the greatest oppressors of the Jews in history, why was it so important that he be treated with dignity?