I didnt say it was gonna be good
Yes, it's filled with anti-synergies. Yes, it will be a nightmare to get Filavandrel handbuffed to 12, unless the remaining ST card to be revealed helps up a lot with this. And yes, Filavandrel is probably overcosted.
I will try to do this on casual, it will probably take me a respectable amount of tries to do so.
But on a long R3, assuming i was able to get Fila to 12 before: play Fran, play waters of brokilon, play call of nature (or other tutor) to play Fila into 2nd WoB, spawns the 3rd WoB, in 3 turns.
The fledgling dryads will be all at 4pt, and elves wont procc em anymore, but with so many engines you can probably get a win with just bronze harmony proccs on the following turns (dwarves, witchers, beast, etc).