The Captive Assassin

Listo, the leader of a band of assassins, was taken captive by an opposing kingdom. "Give your daggers," said one of the generals, "Or you are to be executed. But since you killed so many of our knights, we shall give you a small test. You must say a statement. If the statement is true, we burn you on a stake. If the sentence is false, we stab you through the heart. If you do not say anything, you are thrown to the lions. If you say something we can't verify, you will be forced to drink a cup of hemlock. If it is not a statement or if it is a paradox, we simply toss you into the nearby volcano. We shall give you one hour to ponder."

What should Listo say?