I love the theory and the combo, it makes perfect sense. Unfortunately this particular deck won't really work, because it has no stalling mechanics.
If a deck has nothing to stall with, it is essentially a rush, and if fully upgraded should be aiming for 6ttw. This falls way, way short of that. SoBra actually hurts you here, because you are essentially waiting until voids have taken enough health away for your OHKO, so giving your opponent cards too just speeds up their attack.
Options:
Nova could supply Sundials which would help with drawpower instead of SoBra, and would mean you wouldn't need the Fireflies.
Wings or Fog could help stall to your victory.
Something like:
Hover over cards for details, click for permalink
4vj 4vj 4vj 4vj 4vj 4vj 5rp 5rp 5rp 5rp 5rp 5rp 7ms 7ms 7ms 7ms 7ms 7ms 7n0 7n6 7n6 7n6 7n6 7n6 7u2 7u2 7u2 7u2 7u2 7u2 8pt