After the idea was raised, and people displayed a large enough interest, we've decided to launch Past format warring and it'll be a subsection of regular warring, with 3 man teams, in the near future. We'll be rotating between a variety of past formats to keep up variety and just general interest by playing a range of things.
If you might be keen to play, express an interest in the poll here http://duelistgroundz.com/index.php?showtopic=164686
And go to the nominations thread here where we're deciding on the first block of 3 formats. http://duelistgroundz.com/index.php?showtopic=164632