In the discussion about strategy for Legacy in Tactics tournaments, part of one of the posts talked about 'the mid game', which reminded me of something I noticed in watching the PAX East tournament: I don't think there _IS_ a mid game.
I don't have hard numbers to back up this impression, but I think most games were completed in 3 rounds at most, and often in just 2. Don't count on a strategy that involves building up and building up or getting into some very particular position that will require a lot of jockeying around. If you're playing against an experience opponent, the game will be over before you get there.