First, to Phil. While I'm not trying to start a fight, I belive M:tG is the 'best CCG of all time'. L5R can only hope to have the R&D that WotC has.
Second, yes, I'm planning on making an L5R mod for Dominions II. If it works, I'll try to hook the L5R player base on it, and if successful, that will create a rather large market for the game.
Lastly, regarding Unicorn balance issues... I can certainly see problems trying to field an all-Cavalry army.
Bayushi Tasogare