Light and Darkness Ritual, feat. Regenesis and The Smiths

Still testing out options.
Something that I was just messing with and did not think would work at all, but it can sometimes actually work:
Light and Darkness Ritual, Regenesis, Fiendsmith! (with a bit of Unchained)
Lots of fiends with lots of synergies. It is usually possible to bridge from one engine into another during the game, so if one of your engines is stopped, you can continue with another.
The issue is, of course, a small amount of non-engine. But these engines like to also board break while establishing themselves.
Tour Guide From the Underworld is your key to access all 3 engines:
- Doomdog Octhros summon and link off, to get to Regenesis Archfiend 
- Buio the Dawn's Light summon and XYZ into Melomelody the Brass Djinn, to get to Fiendsmith
- Access any fiend from the deck (all 3 engines):

Tour guide > SS Buio
Send both to make Unchained Soul Lord of Yama
Buio add Mutinity, Yama add Unchained Soul of Sharvara
Mutinity make Aerial Eater with Guide and Buio, and mill the fiend monster
Aerial eater + Lord Yama = Unchained Soul of Rage
Sharvara SS destroying Soul of Rage
Soul of Rage chain link 1 add the milled fiend, Yama chain link 2 remove to revive a fiend (Soul of Rage for an interruption or Aerial Eater to make Caesar with Sharvara).

Also, you can end in the same set up with Fiendsmith, starting with Engraver or Tract, and without using the normal summon,
Standard Fiendsmith combo starting with Tract until you have Lacrima and Engraver in the field
Tract GY effect, remove to make Lacrima fusion with both, Lacrima revives any of the 2.
Lacrima + the other monster = Sequence
Sequence uses Lacrima main deck and Requiem to make Aerial Eater, Aerial Eater mills the fiend monster that you can add.
Aerial Eater + Sequence = Lord Yama. Lord Yama add Sharvara, Aerial Eater revives removing Lacrima + Engraver.
The same combo than before making Soul of rage after this point.

If you have your Regenesis engine set up, you can banish the Magician of Dark Chaos - Black Chaos after summon, for the Dark Magician of Destruction. Since you can return to hand Regenesis monsters to summon out the Black Luster Soldier - Soldier of Light and Darkness.

Small world also has some nice ways to bridge with the extra cards in hand (also, remember not to banish your "1 of" engine pieces with it). Here is a cheat sheet:

https://imgur.com/a/19yj764

(generated via: https://x-x-i-l.github.io/smallworld/)