That deck is all about SPEED. A diverse attack of speed. Sundials are not necessary. If your fast enough; besides, you're already using plenty of quanta.
-Sundials don't use time quantum
-It takes 6-7 turns to get the quantum for the dragons
-What if the opponent counters the dragons the turn after they are played? You're screwed.
All in all, take sundials.
The killers of Dragon Decks ladies and gentlemen.....
Reverse Times
Edit: Also, Sundials can stop attacks, givin' you time to stall for quantum.