As said before me, a speed rainbow minimizes bad draws, and optimizes quanta use...
IMO, a rainbow to be FAST needs 30 cards at max, and it must be supported by the only card that could generate tons of quanta: supernova (an upped card)
This deck has a huge quanta use...and a slow quanta production...
And needs a little balancement...for example what about an ice shield instead of procastination?