For those who are new to the Game I made a Water EX Farm only using General Pool Friends and limited Story Cards,
https://youtu.be/D9eRNkycsug
I was away from my phone when it ticked over to 200. However caught 151 on Video. Done post Combat mechanics buff, but would work fine before hand.
Self imposed Rules: General Pool Characters Only, 1 of each MLB 5 Star story cards which have been available in the general pool for over a year.
No Event Story cards from events or Main Story past 4.2.2 (I have 1, Nameless Adventure's which is at level 6 used as a Yang Up continuation). Unfortunately I only have 1 Ichirn who was bricked for Reimu L1 EX. Ichirin Does a lot of damage I am pretty sure a 8SP Ichirin would be able to work, hard part I suspect is getting the damage required to gauge break/kill Alice on turns 3 and 5. On Narzin Spell card 4, Moriya Anniversary complete Water EX for the first time.
The team is totally shielded from damage during this run so is reliable. Get the first Moriya Anniversary through completing the stage for the first time.
Turn 1: Swap SP friend out for Narzin.
Nazrin, Use all Skills, Graze 2. Boost 3, Spell Card 1
Murasa, Graze 2, Boost 1, Spell card 2 on Marisa
Ichirin, Graze 2, Boost 1, Spell card 1 on Marisa. Marisa is now barrier broken.
Turn 2:
Nazrin, Graze 2, Boost 2 Spell Card on Marisa.
Murasa, Graze 2, Boost 2, Spell Card 1.
Ichirin, Graze2, Spell Card 2
Marisa's Gauge Breaks.
Turn 3
Nazrin, Spell Card 4 on Alice.
Murasa, Boost 3, Last Word.
Ichirin, Boost 2, Last Word.
Marisa Dies, Gauge break on Alice and Youmu.
Turn 4:
Nazrin, Graze 1, Boost 3, Spell Card 3
Murasa, Graze 1, Boost 2, Spell Card 4 on Youmu.
Ichirin, Graze 1, Boost 3, Spell Card 4.
Youmu now has all barriers broken.