VaEra Exile and Redemption (089) The event of the stick becoming a serpent and then a stick again and only then swallowing the sticks of the Egyptian magicians goes to the core of all the ten Makkos to show Hashem’s dominance over the Pharaoh. This explains why so much of the miracle remained un-predicted.

Vaeira Exile and Redemption (090) This class continues the Sicha, explaining the point of this miracle with the serpent, to show Hashem’s dominance over the Pharaoh.