This is the most consistent synchron deck I've managed to come with in 16 years of building the same deck over and over.
It can often still brick, but you only need an adventurer card and jet synchron (searchable in many ways) to get the full combo started.
The point of this is to protect junk speeder's effect at all costs. You can negate an effect mid-combo with gryphon rider, play dark ruler no more or called by the grave.
Full combo:
Adventurer combo (summoning gryphon rider), jet synchron + token => Junk Speeder
Necro synchron effect: you increase junk speeder level by two. Jet synchron + Junk speeder => Crystal Wing
Crystal Wing + Stardust synchron => Crimson Dragon. You draw synchro world and activate it
Jet synchron effect, Jet synchron + Gryphon rider => Accel synchro sturdust, effect: Summon Jet synchron
Revolution + Accel => Psychic End Punisher ; Crimson dragon effect: Summon Shooting majestic star dragon ; Jet synchron + Psychic End Punisher => Crimson dragon (again)
Revolution effect: you summon it, Stardust synchron effect: you tribute revolution to summon it (Stardust Trail follows, you increase it's level by one with Stardust illumination)
Necro synchron + Stardust Trail => Power Tool Dragon ; Power tool effect: you draw Living Fossil ; Activate Living fossil: you summon Revolution Synchron
Revolution + Power tool => Chengying ; (at this point you will have 12 counters on synchro world) Synchro world effect: you summon Crystal Wing
(If you have activated at your mark you can use two counters on the field to draw 2)
In the opponent's standby phase you summon Majestic Star Dragon with Crimson Dragon effect
Final board: effect negate + destroy all opponent cards', effect negate, monster negate, Chengying
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