There's a new king of Pauper, and its name is UR Tempo. The first time I played against the deck, I assumed it was a Delver deck. Imagine my surprise when I saw a few decklists and none of them contained a single copy of Delver of Secrets. This is a true aggro-control deck: it can transition seamlessly from beatdown to control and back to beatdown. The deck isn't easy to play, and a small mistake can lose an otherwise winning game. That said, there are enough games where the card quality will carry an imperfect pilot to victory.
The videos are pretty self-explanatory, so go give them a watch!