So I'd stopped making my living using the dark arts, and turned to teaching them.

Finally, Democrats lose because they are not good at the dark art of politics.

Games programming is something of a dark art, isn't it?

Now there were few who admitted to the dark arts.

To his fellow practitioners of the dark arts he no longer had any name at all.

This is where the dark art of awards season campaigning comes in.

Whether they were the first to find out/report is a different matter, but a lot of the is like a dark art to me.

No one will learn what Hogwarts would call the dark arts, though.

He made a career out of these dark arts.

It indeed appears a dark art - but one whose influence has a more measurable effect.