Off of 1 start you can discard 1, draw 6, and end on multiple negates + Dweller. Won't be legal in the TCG until Roland is printed, but you can run the same combo without Gearfried using Accel Synchron.
I came up with the Librarian combo first, initially out of Isolde. It uses all of your monster zones, including the extra monster zone, and ends on discard 1, draw 5, with Savage and Crystal Wing Synchro Dragon. However, it doesn't use your Boot Sector launch, meaning A) you end on quality negates and card draw before you need to Launch, and B) You can use Launch to start your combo off of any normal summon + a Rokket.