Wonders: This refers to the blood. Why does the Haggadah single out the plague of blood? It is because of the plague of blood, that the miracle was made even greater. Also, Israel became wealthy because of the plague of blood. All the miracles that God performed in Egypt were brought about near a body of water. Israel also became wealthy because of the water. Rabbi Yitzchak, when an Israelite and an Egyptian tried to drink water from the river, the Egyptians drew out blood and the Israel drew out water. As a result the Egyptians had to buy water from the Israelites at great cost and the Israelites enriched.