This deck in my opinion is extremely fun and really reminds me of the play-style of PK Fire. But first things first, this deck "kinda" solves the problem with flundereeze instantly having to pass after being ashed or imperm, as the simorgh field spell gives you a second normal in some situation and the baby simorgh birbs can sometimes bait a negate, but as it stands, it's still an extremely hard deck to pick up and learn, as your combos really depend on you going first and not drawing a hand full of monsters that require a 1 to 2 tributes to summon, but if you are willing to learn this deck, you will find that a lot of the recent meta decks can't play through Empen, Surprised Raiza and for some really odd reasons, Dark Simorgh.
DUMB SYNERGY FILLER :
First, THE SIMORGH FIELD SPELL IS OP AF, HOLY HELL DOES IT HELPS FLUNDEREEZE.
Second, The simorgh birbs triggers the flundereeze's banish effect. (simple enough)
Third, Darkness Simorgh gives flundereeze the option for a negate, but remember you can't special summon the turn you used any of the flundereeze effect. So the main strat with it is to special summon it during your opponent's turn with the effect of the Flundereeze field spell tribute summoning something like Raiza or Empen or you can normal summon it on your turn. Whatever situations suits you.
That's all I got to say, but is this deck is hella fun. Really reminds me of PK Fire and really does live up to it's legacy.