Edit: With the TCG banning Baronne, I had to switch out Baronne for another level 10 synchro. As it turned out, there's a level 10 synchro Icejade monster that needs a water tuner; Ib is a water tuner so that fits.
The board will definitely be weaker without Baronne, but pairs decently with Chengying since it banished cards that you respond to with its effect and if it's in the GY when your opponent banishes something you control (like with S:P) it can be brought back.
A combo deck that attempts to end on Runick Fountain, S:P Little Knight, Baronne de Fleur, and Swordsoul Supreme Sovereign - Chengying.
Most hands uninterrupted can go into S:P + Baronne (or Chengying), others can go into just Fountain + S:P.
Combo Line 1: S:P + Either Synchro + World Chalice + Runick Fountain
Any Runick Spell (except Fountain) + Any lvl 3 (Ash Blossom & Joyous Spring, Chosen by the World Chalice, Ghost Ogre & Snow Rabbit)
The most common hand assuming you don't draw World Chalice or you drew runic + hand traps:
Play any runick spell to special Hugin, activate Hugin to grab Fountain, play Fountain, Normal any lvl 3, Synchro into Ib (in the EMZ), Ib grab World Chalice, link the EMZ Ib into Gravity Controller, Ib special Chosen from deck, link Chosen into Imduk, Extra Normal (tributing Gravity Controller) World Chalice, link World Chalice + Imduk into Aurum, special Lee + Guardragon (put Guardragon in one of Aurum's link arrows), Lee grab World Chalice, activate Aurum to pop Guardragon, special from grave Ib, link Lee + Aurum into Lib, Aurum effect to special World Chalice from hand, Ib + World Chalice synchro into either synchro monster, Lib effect to set World Legacy Heart, activate World Legacy Heart to put Ib back into ED and World Chalice to hand, Guardragon in GY effect to special Chosen to a Lib arrow, link Chosen to second Imduk, link Lib + Imduk into S:P, activate Imduk effect to special World Chalice.
Combo Line 2: S:P + Either Synchro
Chosen by the World Chalice + World Legacy - "World Chalice"
If you somehow only have World Chalice and Chosen w/ no Runic Spells (or Hugin gets removed before you can use it as synchro material):
Normal Chosen, Link Chosen into Imduk, Extra Normal World Chalice, Link World Chalice into Almiraj (Ash chokepoint), Special Chosen + Lee from World Chalice effect, Lee grab Guardragon, Synchro Chosen + Lee into Ib 5* (under Almiraj), Ib grab World Legacy Heart, Activate World Legacy Heart to return to hand Chosen + World Chalice, Activate Lee in GY to add to hand while sending Guardragon, activate Guardragon to special Chosen to Almiraj's link arrow, Link Chosen into second Imduk, link Imduk + Almiraj into Lib, Imduk effect special World Chalice from hand, Activate Lib to set World Legacy Succession, synchro Ib + Chalice to make a Baronne/Chengying, special World Chalice from Ib effect, link Lib + World Chalice for S:P.
Combo Line 3: S:P + Both Synchro + Runick Fountain
Any Runick Spell (except Fountain) + Emergency Teleport + any World Chalice monster (except World Chalice Guardragon)
This route is one of the strongest you can get, ending with 2+ cards in hand while having Fountain + both synchros + S:P. If you are lucky, you also can end with World Chalice though it rarely happens due to interaction. The World Chalice search is also chainblocked by Imduk for safety.
Play any runick spell to special Hugin, activate Hugin to grab Fountain, play Fountain, play Emergency Teleport and grab either Ghost Ogre or Chosen, Synchro into Ib (in the EMZ), Ib grab World Chalice, link the EMZ Ib into Gravity Controller, Ib special Chosen from deck, link Chosen into Imduk, Extra Normal (tributing Gravity Controller) World Chalice, link World Chalice + Imduk into Aurum, CL1 World Chalice -> CL2 Imduk, Imduk summon the extra World Chalice monster to a zone away from Aurum, special Lee + Guardragon (put Guardragon in one of Aurum's link arrows), Lee grab World Chalice, activate Aurum to pop Guardragon, special from grave Ib, link Lee + Aurum into Lib, Aurum effect to special World Chalice from hand, Ib + World Chalice synchro into either synchro monster, Lib Effect to set World Legacy Succession, activate World Legacy Succession to summon Ib, Ib + World Chalice synchro into the other synchro monster you didn't summon before, Guardragon in GY effect to special Chosen to a Lib arrow, link Chosen to second Imduk, link Lib + Imduk into S:P.