Clustering Wishes Turn into a Cosmic Star

Pretty straight forward as it is mostly gas. Goal is to bring out Junk Speeder then swarm the field with his effect. Then, just do math in summoning monsters and calculating levels. 

To make the most out of it, touch the token generating monsters (Doppelwarrior and Synchron Carrier last) since they need space to summon tokens. Use Celestial Double Star Shaman late in the synchro climb to bring either Doppelwarrior or Junk Converter back from the Graveyard or to summon Quilbolt Hedgehog from hand as upon synchro summon, they'll be able to summon something else or themselves. 

Bring out Crystal Wing first to stop Nibiru. You can bring him out as a fifth summon easily:
Summon Tuner -> Summon Non-Tuner -> Summon Speeder (adjust level of tuner if needed, you can do this with Stardust Illumination's second ability if you happen to start with Stardust Synchron) -> Summon Tuners (1-5) -> Summon Crystal Wing Synchro Dragon 

Note: Just be careful not to mistime with Converging Wishes Dragon if using Shooting Majestic Build.