First off, I think that white may see a little bit of a setback with Prophecy, but with Rebel decks being the new WW and white getting better creature control than black (still don't understand this one, from a "color flavor" point of view), I think that it's about time that white sat on the back burner for a set. Plus, Cho-Manno, Revolutionary, Lin Sivvi, Defiant Hero, and Mageta the Lion...there aren't too many groups of three Legends that stack up like this. (I don't know, maybe you prefer Ascendant Evincar, Volrath the Fallen, and Greel, Mindraker?)
I like playing green, and I think Mana Engine Green will become the new stompy, as players line up mana elves, Gaea's Cradle, and then proceed to beat down with Stampede Driver and Vitalizing Wind (35 damage turn 5 isn't bad). Green got some real winners, and the large-effect-for-large-mana-cost cards fit perfectly with green's natural tendencies, so green just seems to be the best suited to Prophecy.
garfobosonfire (sorry, off topic):
I don't know how the tag game exactly works this time around, but I know that the first game required you to have TAG GUARD be at the top of the post, or at least in the first line. You've been placing it at the end of the post, and I'm surprised no one has called you on it so far.
Of course, what do I know? I'm not even playing...