The biggest question that's always stuck in my mind is how to properly gate submissions. I have some concern that requiring each player to create an account would turn some people away, but I can't think of a better way to prevent people from stealing each other's names or easily submitting multiple decks to game the system. On second thought, maybe the people who can't be bothered to make an account aren't the kind of players we want anyway.
the important thing is that you need to have it take advantage of social media, as that's the major communication medium nowadays (that probably means a twitter account and/or facebook page to advertise)
i haven't used facebook in forever, but it should have a private messaging system so there's that
In last season's thread GS mused about a 3CM blog (and about advertising elsewhere, like Reddit). I think that may need to be its next incarnation - a not-forum-system-bound 'Hub' for both strategy articles and actual round management, which could field participants brought in from all over the interwebs (because I think it's been demonstrated that luring people to become subscribers in a small niche forum system doesn't fly in 2017). I'd definitely be in to help that with the content and participation, but I'm not nearly schedule-compliant enough to spearhead it.
the potential issue is that there's a finite amount of strategy content, but it shouldn't be difficult to keep content narrow in scope
(set reviews are going to be simple because there usually are not that many cards worth reviewing)