I know Yusei used Synchro panic for his limit over accel synchro summoning but I'm wondering if starblast can do the job also :O --- Dueling Network Name : trevor813 with Yusei Avatar GO STARDUST DRAGON! SHOOTING SONIC!!!!
Its not even comparable to the combo Yusei used in the anime. Synchro Panic (even if it was a real card) it's too situational. Also Life Stream Dragon had the ability to reduce the level of every other monsters except himself to 1.
There are also Cost Down and Level Conversion Lab however you mentioned that you want to Limit Over Accel Synchro Shooting Quasar so reducing the levels of monsters in your hand wont benefit...
So yes, Star Blast can give a hand if used wisely.