How about the Forbidden Forest? [img]http://vignette1.wikia.nocookie.net/creepypasta/images/6/61/Dark_Forest.jpg/revision/latest?cb=20120720071502[/img]

The team whose members all die loses, and each player must response to their opponent's last post within 48 hours or forfeit. That way some of us won't need to wait a week or two for a reply and risk forgetting about the whole thing, which I've seen happen countless times.