I had been thinking for some time about doing an exhalted deck myself, but the fact that you have to attack only with 1 creature when you're running 25 in the main deck, makes me think it's not a great strategy. Even that, I like the idea, but I personally think it would be more consisten with less creatures, or using more mana generators: 4
birds of paradise and 4 noble heriarch (I know thwy're expensive) or maybe
sylvan caryatid. That would be good for sublime angel but won't make you loose value.