Let's say something really outrageous like, "God's in control and prayer changes things!"
As one who believes that is here summarized as "Calvinism" is simply a synopsis of the teachings of the Scriptures regarding the nature of man and redemption by Christ, I have no problem with this statement. I would point out that I believe that God answers prayer in accordance to His will. Nothing He decrees is contigent upon anything I do. That is the nature of sovereignty. One of the biggest changes resulting from my prayers has been His changing of my attitude and perspective. I would suspect that you agree with this statement.