Thresh/Leona
How is it that these supports are not considered OP? Is it not a clue that they are played in a third of all games? Do people not notice they do more damage then any other champ for the first ten levels, and they are tanky as hell, and they have ridiculous crowd control that is easy to land when ever they want? What more evidence do you need?
Pick any combo of these marksmen and supports, then reap the souls of both Leona and Thresh with your awesome poke.