i've played a few dozens of games, and honestly i don't find this deck very efficient. i'm using a slightly modified version, without quanta towers.
first of all, there are many FGs against which it's completely impossible to win, and unsurprisingly they seem to come out most often for me.
second, i find the win/lose ratios in the OP quite unbelievable. i've happened to lose three times against miracle for not being able to drop a purpel nymph soon enough, and same happened with other allegedly easy FGs.
it's a good deck, but it's not so fail-proof against any FG, and it's not as fast as many claim it to be.
the luck component (with draw, mana combinations, etc.) is too relevant to make it a "great" deck.
as for now, i still find rainbow superior. unfortunately i sold mine to make this nymph deck, cause i was bored of rainbow, so i'll stick with this one for a while...
edit: just to add that at the moment i'm 0 wins 3 losses against both obliterator and miracle, which are supposed to be the easiest ones.