Recalling first that life is a zero-sum game
It's not a zero-sum game, and you know it, and good dark artists know it, so either this post is supposed to be funny, you're straw-manning dark artists to signal you aren't one of them, or you're trying to shock us with how dark you are. Probability of useful material about how dark arts work, intended to defend against them: low. Probability of useful material about how to succeed darkly by a skilled dark artist: low.
The arena you're practicing the dark arts in also isn't immediately clear. Eventually it looks like you're talking about politics, which makes it unlikely that you've actually put this to practice successfully.
If the players of the game are the all minds in concept space (with the appropriate weightings, since this set is infinite), then I think it might be reasonable to say that life is a zero-sum game.
There are some players have no ability to control the world unless we simulate them. However, since it is possible for us to simulate them, if we wanted to represent life as a game, we would have to include all of them as at least potential players.
Recalling first that life is a zero-sum game, it is immediately obvious that the quickest and easiest path to success is not to accomplish things yourself—that's a game for heroes and other suckers—but to tear down the accomplishments and reputations of others. Destruction is easy. The difficulty lies in constructing a situation so that that destruction is to your net benefit.
The problem with destruction is that it invites retaliation. Even when your talent for lies, slander, and other dirty work is superior to your opponent's, he will still manage to cause you difficulties. When there is a third, uninvolved party, all they need do is stay out of it until you and your opponent have beaten each other down, and they emerge the winner.
It is therefore crucial that you prepare the way for your destructive ascent by polarizing the field into two camps. There must be no third parties or positions. If there are three political parties, you must begin by crushing the weakest. If there are three or more possible opinions on a matter, you must introduce terminology that conflates them and makes it appear that there are only two. Uniting your opponents is not beneficial, but making them appear to be united is, as it allows your attacks to strike them all at once. The vicious arts can thrive only when the apparent choices are first narrowed down to two.
(The mirror tactic is to narrow down the number of choices to one, and present them as two. We shall cover that in Dark Arts 201.)