Miracles are miracles nothing more and nothing less. God is nothing less.
It's not abnormal or unusual for God to perform miracles.
Too much emphasis is like not enough.
Take a breath enjoy a miracle . Have a baby enjoy a miracle. look into the eyes of a loved one, enjoy a miracle.Receive the gift of understanding form the word of God enjoy a miracle . etc
It is when men try to make them into a sign and wonder... or a sign that causes a wonder (faith issue) to confirm something that is not visible . This is where the rubber hits the road.
God performs miracles all day every day. Healing whosoever he has mercy on. There are no signs needed to confirm those who believe prophecy (the word of God) They have a understanding what it means to walk by faith (the eternal will)
When he sent Moses as an apostle who was trusting prophecy as to the four hundred years they would be in bondage spoken to Abraham before. Moses refused to go . So then God sent Moses with "two signs" to confirm their unbelief as to not hearing prophecy.
There is used the rod of Aaron used to divide the believers from those who do not believe the word of God (prophecy) the rebels.
Knowing beforehand they would not believe the first "sign of rebellion". He would bring the second sign pointing to a "matter of life and death" . Dead flesh like leprosy (hand was leprous as snow.) to show there is no sensitively to the word of God pricking their consciences . Leprosy the disease of no pain or sensitivity used against them as a way of judging those who refuse to hear prophecy.
Continuing with the third sign to show their rebellion in refusing to hear prophecy
Exodus 4:1-10 King James Version (KJV) And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The Lord hath not appeared unto thee.And the Lord said unto him, What is that in thine hand? And he said, A rod. And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it. And the Lord said unto Moses, Put forth thine hand, and take it by the tail. And he put forth his hand, and caught it, and it became a rod in his hand:That they may believe that the Lord God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath appeared unto thee.And the Lord said furthermore unto him, Put now thine hand into thy bosom. And he put his hand into his bosom: and when he took it out, behold, his hand was leprous as snow.And he said, Put thine hand into thy bosom again. And he put his hand into his bosom again; and plucked it out of his bosom, and, behold, it was turned again as his other flesh.And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.And it shall come to pass, if they will not believe also these two signs, neither hearken unto thy voice, that thou shalt take of the water of the river, and pour it upon the dry land: and the water which thou takest out of the river shall become blood upon the dry landExodus 4: 1-10
You could ask seeing they will hear the voice of the second or latter sign.... believe what? They will die because God works to will it just as he worked the nand of Moses as the author of life..