...freak.
My favorite type of control is Black control. Now, I like Black/Blue control, thanks to Invasion and Planeshift.
I believe that the easiest ways to "control" an opponent is by discard: Unmask, Duress, Stupor, Ravenous Rats...etc. Most other control types are over-costed, or dependant on your opponent, like countermagic. Discard is specail, because it's active (unlike countermagic which is reactive) AND controlish, both at the same time. I must say, discard also comes in cheap ways: Unmask, Duress, Stupor...
...all that, plus the fact that it plays mind games with the opponent.
I love Black. I love control. I'm coming to liking Blue.