I have been trying to run a Vampire league for the last two seasons with moderate success. The main problems coming up for this format, while running on a standard format, are the draft and trade deadlines. I set the trade deadline as far back as I can, but if the Vampire wins after Nov 29th, he will be unable to take a player from the losing team. I'm sure we can make the teams add/drop players to make the situation work for now, but, overall, a Vampire league setting would be great going forward.