Despite the Diabellstar/Azamina engine being far too pricey to run alongside everything else, this deck surprisingly runs very efficiently like 95% of the time. Piri Reis Map to search Astellar of the White Forest, which is basically your best starter. Astellar alongside Toy Box allows you to perform cold fusion essentially, especially since it allows Toy Soldier to search for Rucia of the White Forest to leave your normal search via Tales of the White Forest for something actually good like Elzette.
Deck Breakdown (I am not a professional):
MAIN DECK:
3x Astellar: Excellent starter, almost always summoning Silvy, plus it summons itself back after you summon Rciela to make an easy Diabell (or Amritara if you already made her). Piri Reis Map at max copies to find her as soon as possible.
3x Silvy of the White Forest: Can also be a great starter if you didnt open a way to Astellar. Almost always searching Tales, or Witch of the White Forest if you already have Tales, or Scourge, if you already have those 2, or Woes if ok I think you get the point.
2x Elzette of the White Forest: A nice extender, a good search off of Witch or Tales, or if you open Toy Box or Toy Soldier, even a starter, since it searches Astellar. But not that good, so you only run 2 copies, don't wanna be bricked up on her
1x Elzette, Azamina of the White Forest: The cooler, more advanced version. That's why it costs 22 points. It can summon literally any White Forest from your hand, and when you inevitably synch it off the field, it can search ANY Sinful Spoil card (hint hint Vengeance hint hint). Or Subversion if you side into it. Great card honestly, unfortunately the fusions are too expensive to run alongside her (RIP Azamina engine)
1x Rucia of the White Forest: It's just an extender. It also helps the synchros dodge targetted effects alongside Silvy. Oh, it nets an extra draw. Thats it, not really much to say here.
3x Toy Box: Fuels all the White Forest effects, and also makes the battle phase dangerous with its secret 2nd effect most people tend to forget about. Running max copies for obvious reasons, you wanna see this card.
3x Toy Soldier: The favourite child of the Toy Box engine. By itself can search Toy Box for more fuel for the White Forest cards, and somehow even better if Toy Box is already on the field because it can search any lvl 4 LIGHT monster (Centur-ion was too expensive, why is Auxila 33 points?) Max copies for obvious reasons.
1x Toy Tank: The less loved child of the Toy Box engine, but don't worry. I love you. It's an extra body on board if you wanna synchro directly to 12, and if needed can tribute itself to unbrick your hand. Not as versatile as Soldier though, but can be searched and constantly recursed by Toy Box so you really only need 1 copy anyway.
1x Diabellze the White Witch: (This card is always treated as a "White Forest" card) AND THANK GOD. Very easy to search, very easy to summon, protects all your monsters if you control Vengeance or Queen, and you're always dumping Curse of Diabell with its effect, unless you wanna flex on your opponent and dump Vengeance to waste your and your opponent's time... or you already drew Filia and you dont need to use it
1x Diabellstar Vengeance: Beauty. Grace. A single target pop and a conditional synchro tuner summon, all for the low low price of half your lifepoints. Steep cost, but the only lifepoint that matters is the very last one, so who cares. Easily searchable off of Filia or cooler Elzette, can summon from GY too, so destroying it does nothing for your opponent (unless you run out of traps to banish lol)
3x Tales of the White Forest: Main searcher. Fuel for the Forests. Can pitch off of Astellar, set itself back, send for Rciela, then get it back with Queen and search for Diabellze or Elzette... or Rucia I guess...
1x Witch of the White Forest: Second best searcher after Tales, but 33 points holy hell! At least now you don't have to worry about locking yourself out of your Azaminas if you use it to search a starter (I miss them). Plus it turns your lvl 2's into tuners so you can jump to Chengying (Chaos Angel too expensive) or Poplar if needs be (Just ignore the dark Satellite Warrior in the extra deck for now, thanks). And after it's served its purpose it can simply be sent as fuel for the Forests. Lovely card.
1x Scourge of the White Forest: I had 1 card slot left to fill and after perusing all the possible white forest and sinful spoils I could splash in, Scourge beat out Morrian because it can be used turn one. Plus a negate that can recover Diabellze/Queen/Poplar/cooler Elzette sounded too good to pass up. Your White Forest synchros are all easily recoverable due to Silvy and Rucia anyway.
1x Filia Diabell: It has one purpose, which after it fulfills, it becomes useless. No need to run more than one. Easily searchable off of Curse, which is easily searchable off of Diabellze, which is easily searchable off of any of the 20 million White Forest searchers. It's purpose is to search Vengeance then be banished forever. +500 atk also nice.
1x Curse of Diabell: It has one purpose, which after it fulfills, it becomes useless. No need to run more than one. Easily searchable off of Diabellze, which is easily searchable off of any of the 20 million White Forest searchers. It's purpose is to search Filia Diabell then be banished forever. Fuel for the Forests.
1x Woes of the White Forest: Only one copy, but thats all you need, can be searched off of Silvy or Rciela if you really need it. Fuel for the Forests, which can then come back to summon ANY White Forest monster from Hand or Deck, after which you can quick synchro into any White Forest synchro (Its Silvera if you're curious). Unlike Morrian, which is a Book of Moon, Woes is effectively a Book of Eclipse without the drawing. You can also get Queen if needs be to stagnate the Silvera summon to a more opportune time.
Non-Engine Time!
3x Piri Reis Map: It gets Astellar, what more do you want me to say? Drew it and a copy of Astellar in your opener? Congrats you don't need to pay half your LP and it can be fuel for Astellar. Necessary consistency piece, tried the deck without it, because I'm not fond of paying half my LP twice, but kept bricking like crazy. Load bearing card.
3x Ultimate Slayer: Genesys staple. Honestly such a good card, I thank the TCG devs that they didn't point this card. Garura, Malong, and Aggregator will always find a place in my deck. Heads up, Enigmaster Packbit unfortunately does not trigger your Forest Spell/Trap on either effect, and your extra is tight enough, don't fall for the bait.
3x Book of Eclipse: I had 20 points left over after adding all my necessary engine cards, and was debating between Ghost Belle, Ghost Ogre, Droll, and Nibiru. But after testing they bricked like hell. This card can become Fuel for the Forests if needs be, plus it and Silvera being used on the same turn can cause people to ragequit. I'm aware I can drop this and play Chaos Angel in the extra, but this adds needed power in the main deck without compromising consistency or reliability.
3x Skull Meister: Genesys staple. GY effects are very common and this is free, so why not. Plus, can be used as a lvl 4 for sycnhro purposes if you're really down bad.
1x Mannadium Reframing: Omni negate counter trap. Searchable off of Amritara. All it needs is for you to control a Synchro. Easy addition to the deck.
EXTRA DECK:
Rciela, Sinister Soul of the White Forest: Main combo piece. Basically what you go for first almost all the time. Gets any White Forest spell you need at the time and can be used to go for Queen. Also underrated, it can search ANY LIGHT SPELLCASTER (dear god why is Centur-ion so expensive). Can be bounced by Silvy and Rucia from field or GY. Good card.
Silvera, Wolf Tamer of the White Forest: I heard you like Book of Eclipse. Can be summoned Queen or Woes on your opponent's turn. Also has the added effect of adding +500 atk to your Illusion and Spellcaster synchros, and secret effect, makes them become Chaos MAX with double piercing. Oh did I mention that Silvera's book of eclipse effect isn't once per turn? You can bounce it back with Silvy and Rucia and summon it again. Isn't that funny?
Diabell, Queen of the White Forest: The White Forest "Boss Monster". Recovers any spell on summon, and can summon your tuner synchro on your opponent's turn from basically anywhere. You're mainly summoning Silvera because Book of Eclipse on legs is very strong, but on occassion summons Poplar and Zapper Shrimp, both of which can quick synchro. Can be used as synchro material and recovered via Rucia and Silvy, then summoned again to set up. Honestly such a good card, I see why it costs 25 points. Just remember you need to summon it with a synchro tuner specifically to return a spell from GY.
Poplar of the White Forest: We have Poplar at home! Jokes aside, while you dont often go for this one, it can definitely come up. Summon it on your opponent's turn to quick synchro into Legatia or Vengeance Dragon, or even Silvera if you have a stray lvl 2 on field, because everyone loves Book of Eclipse. Plus, on your turn you can set up your cards to summon Doom Dragon for board breaking purposes. He's no Snake-Eyes Poplar but he still does a good job.
Snake-Eyes Vengeance Dragon: According to lore, this is Poplar's final form. And yeah this guy's GOOD. It does what Sinful Spoils of Subversion - Snake-Eye does but as a quick effect, then can pop 2 cards during the Battle Phase. Only drawback is that it has the Mirrorjade condition, where you can't use the Subversion effect again during the next turn. Still a very solid card, and your go-to lvl 12.
Snake-Eyes Doomed Dragon: I genuinely have no clue where this card fits in the lore. Anyway, its also Subversion on summon. The only way to really summon it though is via Poplar set up, after which it's used as synchro material for Vegenace Dragon. Still an include though, that's still very good.
Visas Amritara: It searches Mannadium Reframing. Anything else it does is just a plus. It can pop one of your own monsters to free up space, and also give an atk boost to Synchros, and makes Reframing destroy the card it negates if it's still face up when on the field. Your go to lvl 8 after getting Queen set up (unless you drew Reframing).
Zapper Shrimp: Queen can summon it and it not only pops a spell/trap, but triggers your Toy Box engine. Plus it's perfectly suited for quick synchros into your lvl 10's (or on occassion your 12's).
Tri-Edge Master: During testing of this deck, there is a 1 in 1000 chance that you end up in a scenario where you would end up with too many Tuners and you need just one lvl 6 non-tuner synchro to unlock everything. Every time I thought this card was useless and took it out, that scenario came up again and I regret it. Swap him for a more useful monster if you wish, but watch out!
Centur-Ion Legatia: Generic lvl 12 synchro that draws a card and pops a monster on summon. Protects your weaker monsters from battle and has a whopping 3500 atk stat. Great quick synchro target.
Swordsoul Supreme Sovereign - Chengying: Generic lvl 10 that's just very good all-round. Buffs itself, lowers your opponent's atk stats, protects itself and banishes 2 of your opponent's cards when anything is banished? Easy include (If Chaos Angel didn't cost 20 points, he would be here instead).
Satellite Warrior: Th elephant in the room. Yes, he's dark attribute. Yes, he conflicts with Witch of the White Forest. But only on your turn. He makes for a perfect quick synchro target when mass removal is needed. Plus he becomes BIG if he pops anything. +1000 atk for each card destroyed gets a little nutty.
Garura, Wings of Resonant Life: Ultimate Slayer tax. Plus a draw one is neat.
Mereologic Aggregator: Ultimate Slayer tax. Plus a targeted negate is neat.
Golden Cloud Beast - Malong: Ultimate Slayer tax. Plus a bounce is neat. Wait... What's this? We're getting reports that this card can actually be used in this deck offensively? Oh wow yeah, it can. You can summon it and use it as a bridge to Queen or Amritara and still get it's bounce effect. Okay that's pretty neat ngl. And it triggers Queen because its a synchro tuner!
The Side Deck is whatever fits your needs at the time, I think Subversion is funny. Have fun! (And if you read this far, thanks for taking the time out)