Note:

• If your starting hand has another Level 4 or 8 Gimmick Puppet monster (except Cattle, unless you have Dreary Doll in the deck) or any Level 8 extender, you don't need 2 Scissor Arms to FTK.
• If you open with Scissor Arms, you don't need 2 Number 15s to FTK. However, having 2 Number 15s makes the combo pretty safe against Nibiru.

This combo was mainly made for situations where Mansion gets Ashed. If your opponent doesn't Ash Mansion, this combo is basically the same as Nikhe's Nibiru-proof combo. If you open with Scissor Arms, this combo is also pretty safe against Nibiru. There's only one Nibiru timing that can actually make you fail the FTK: when you activate Number 15's effect targeting Number C40 while your opponent is at 3200 LP. If they drop Nibiru at that point, you can still Rank-Up into C15 and use it to destroy Nibiru and burn them for 3000. So even if you fail to FTK, your opponent will only be left with 200 LP.

And with Fanatix still on your end board, you're pretty much guaranteed to win anyway.

Credit to Pickles.