Went 3-0.
Round 1: Bye (2-0)
Round 2: Bant Control: 2-1
Round 3: Esper Control: 2-0
Against Bant Control, the games were extremely grindy. In game 1, he eventually conceded as he was confident he could beat me in games 2 and 3, as the game was going for so long and there was no end in sight. His Tamiyo's ultimate in Game 2 gave him the win. Game 3 was won by a number of Geist of Saint Trafts, and a Devil's Play to finish it off.
Against Esper Control, the games were considerably easy. The counterspells were really effective at stopping the Planeswalkers and Sphinx's Revelations. If he did get a Planewalker out, it got Detention Sphered. He didn't have any threats, so I was able to just Devil's Play for huge both games.
Overall, the deck works. I was extremely grateful that I didn't have to play against any aggro decks, which are the main problem for this deck. I also only resolved Arcane Melee once in the tournament, and it got Detention Sphered away. I don't think that it is a very effective card, to be honest. It just seems to be overkill that isn't necessary, and that hinders me against aggro. I might take them out.