The purpose of this deck is to use the Swordsoul engine to bridge into Ashtra, and use Ashtra and the small Albaz engine to have a decent grind game.
A. Starter Combo: Fallen of the White
Fallen of the White > foolish (Mirrorjade if you don't have any Wyrm or Swordsoul monster in hand / otherwise Albion) > SS Ecclesia
1. You have Mikumari or Emergence and a card to set
Ecclesia Tribute > SS Mo Ye > reveal > SS Token > Chixiao with Mo Ye + Token
Then, with Albaz + Token, you can make Dragite or any other Level 8 Synchro.
Set your card > SS Mikumari, or use Emergence to add Mikumari and then add any Ashtra monster from Deck and SS it.
EP: Set Fallen from Deck with Albion's effect and add Ecclesia from Deck to hand as follow-up.
2. You have Mikumari or Emergence and don't have a card to set
Synchro Summon Ecclesia and the Dark Dragon > effect, banish it and SS Ecclesia from GY.
Ecclesia effect > tribute > SS Taia > Taia effect, banish Mirrorjade from GY > SS Token > Synchro Summon Chixiao.
You can either set up a WATER in GY for Dragite, or foolish any Swordsoul Spell/Trap to set up its banish effect.
Activate Emergence > add Mikumari.
Then set Blackout > SS Mikumari > effect, add any Ashtra monster from Deck and SS it.
EP: SS Ecclesia and the Dark Dragon back and add Ecclesia from GY to hand.
This sets up a way to SS Albaz from Deck > discard Ecclesia > SS Dogma with 2 OP monsters.
3. You don't have Mikumari or Emergence and have a card to set
Same line as #2, but add Emergence instead of Blackout with Chixiao.
Then set the card you have in hand to SS Mikumari.
4. You don't have Mikumari or Emergence and don't have a card to set
You can only make the Swordsoul line, search for Blackout, and either make:
5. You don't have Mikumari or Emergence, don't have a card to set, but have a Swordsoul monster in hand
Make the #2 line until you get Emergence.
Normal Summon your Swordsoul monster:
SS Token > Synchro Summon Tenyi Spirit > add the Ashtra Field Spell.
Set the Field Spell > SS Mikumari > add any Ashtra monster from Deck and SS it.
EP: SS Ecclesia and the Dark Dragon back and add Ecclesia from GY to hand.
This sets up a way to SS Albaz from Deck > discard Ecclesia > SS Dogma with 2 OP monsters.
B. Starter Combo: Emergence
Very similar to the Fallen of the White lines.
1. You have a card to set
Activate Emergence > add Taia > Normal Summon Taia > banish Emergence > SS Token > Synchro Summon Chixiao.
Activate Summit > SS Mikumari from GY > effect, add any Ashtra monster.
Set your card > SS your Ashtra monster from hand.
2. You have Mo Ye in hand
Normal Summon Mo Ye > reveal Emergence > SS Token > Synchro Summon Ecclesia and the Dark Dragon > banish it > SS Fallen of the White from Deck > Fallen of the White effect > SS Ecclesia from Deck.
Ecclesia effect > tribute > SS Taia from Deck > Taia effect > banish Mo Ye > SS Token > Synchro Summon Chixiao.
Blackout effect in banishment > SS Token.
Synchro Summon Tenyi Spirit with Token + Fallen of the White > add the Ashtra Field Spell.
Activate Emergence > add Mikumari > set the Field Spell > SS Mikumari > effect > add Yoa.
Yoa effect > set any Ashtra Trap.
Activate the Field Spell > send your set card to GY > add any other Ashtra Trap.
By doing this, you will have 2 Ashtra Traps in GY to set up Susano, and you can also set Blackout back with Mikumari's effect.
C. TIPS
If you have the Field Spell set up, you can SS Mikumari-no-Mikoto during your opponent's turn to set a Trap from GY and trigger the Field Spell to bounce 1.
Yoa can be an interruption against Xyz/Synchro decks. Its effect to change a monster's Level can affect your opponent's monsters too, and the Level change is permanent.
If you have Akasuna, try to Synchro Summon Mikumari-no-Mikoto before using Akasuna's effect, because you can send any dead Trap that was set by Mikumari's effect during your opponent's turn to GY.
For me, the best Trap to set first is Divine Domain, because it can negate even if you don't have an Ashtra monster on the board.
You can use Mikumari-no-Mikoto/Mikumari with Blackout.
Red Dragon Archfiend is here to obliterate boards that have been set up thanks to Akasuna's effect.
You have 2 ways to deal with unaffected monsters:
Only Ecclesia, Chixiao, and the Fusion Monsters are needed in the Extra Deck. You can remove any of the other cards.
You can reduce the number of Ashtra monsters, but play at least 1 of each (except Kuzuha, which is not included in this list).
The same applies to the Swordsoul/Ashtra Traps.