The covenant with Moses is already made and most religions hold that you cannot intercede with the Dead for a new covenant.
Like that of Abraham or Moses? No. In addition, Ezra wasn't a prophet.
Moses
The three major Jewish covenants are Noah's Covenant, Abraham's Covenant, the Mosaic Covenant (Moses' Covenant.)
Moses
In the Sinai Covenant, God made a covenant with the Israelites through Moses on Mount Sinai. The covenant included the giving of the Ten Commandments and other laws which the Israelites were to follow. It established rules for the Israelites to live by, and outlined the consequences for obedience and disobedience.
It must be Moses and his brother Aaron.
The Ark of the Covenant is said to have carried the tablets of the Ten Commandments given to Moses by God, as well as Aaron's rod and a pot of manna.
According to Jewish chronology, it was made in 1312 BCE.
Abraham made a covenant with God in which Canaan was promised to the Hebrew people as an everlasting possession. This covenant plays a significant role in the history and identity of the Jewish people.
Moses
On Mount Sinai in Egypt, God created a covenant with the people of Israel by speaking to Moses, their leader. This occurred in Genesis chapter 34:10-28.
The b'rit (covenant) (Exodus 34:10, and many other verses).