The SCP would be a copy of "The Prince" by Machiavelli, but inside all the pages are blank. There would be one page with a handwritten dedication, and when the person holding the SCP flips past it, the blank pages would begin to write themselves, with the letters appearing as if someone else is writing them. The pages would contain in-depth instructions on how the specific person reading can become the president, or the leader of whatever country the SCP is in at the time. The instructions in the book would often be geared towards killing other competition, or using other dirty tactics to gain more power. The pages would go back to blank every time the book closes, and change for each person who picks it up.
Just a rough idea, trying to come up with other things to flesh out here. All feedback appreciated, thanks in advance.