You can make me say anything, long after I die. My edges will cut you. If you throw me I fly.

Riddle: You can make me say anything, long after I die. My edges will cut you. If you throw me I fly.

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Paper.

It is made out of wood which has been dead for some time, you can write anything you want, the edges can hurt you and of course you can make a paper airplane out of it.