I'm not sure whether the corner tactics should be classed as 'Dark Arts' , 'Random Occurence' , 'Skilfull Creation' or 'Black Magic' myself.
At the moment, I am 'testing' a few things with corners, from the Left side I have my own tactics, one Far Post, one Near Post and one 'Mixed' delivery. From the right I have left as default. Five or six games in and no discernable difference at all.
Earlier iterations of the game did have a few 'magic' routines if you had the players, but as a general rule, I try and deliver an in-swinging corner if I want it in the box. My best players based on Heading and Jumping Reach are set to attack or stand in the area it's delivered to. Best Long Shots attribute lurks on the edge of the box.