I Can Speak My Mind but I'm Mute

I, Cheng Yuan, not long after I traveled through time, I was bound to the most awesome system - the Yan Chufa Sui System. Yes, it is the exclusive Yan Chufa Sui for the top combat power in the entire continent. Once a word is spoken, the rules of heaven and earth will follow the words. You can explore the past, change life and death, reach the future, and change fate against the will of heaven. Everything is trivial. It sounds so awesome... The problem is, I'm a damn mute, I'm cracked! ! !