To wash my pallete after building Despia Shaddoll, I wanted to build a purer (and more effective) version of Shaddolls. The idea is to spam Winda, back it with Mechaba, and abuse Nadir Servant to search your Shaddoll cards. The deck is a pile of broken spells and small engines.
For Shaddoll monsters, it is a small package, but not tiny, 3 each of the Squamata and Wendi, and 1 Ariel. You want to open Squamata or Wendi as often as possible to make the fusion spells live, and you need the 1 Ariel for the combos. It is also an incredible interruption. These are searchable off of Nadir Servant funnily enough. 3 of each of the Fusion spells, because we're a fusion deck and need to see fusion spells for the combos. They are both very good fusion spells. 1 of each trap because I wanted to keep the package just to essential cards.
3 Nadir Servant, 1 Ecclesia, 1 Fleurdelis. You don't usually summon Ecclesia, this is a generic Shaddoll searcher that also provides a Light monster for material. When you do summon Ecclesia she remains good. 1 of the Trap seems fine, you don't actually want to be locked out of follow-ups too often in your fusion deck.
1 Terraforming, 3 Meltdown, 3 Aleister, 2 Invocation. This helps give the deck another prong of attack in access to Invoked monsters and access to a good generic Fusion spell for making Shaddolls.
1 Magicalized Fusion, this is usually how you make your first Winda off Verte Anaconda. Guaranteed Windas are nice.
3 Super Poly. We're a little light on targets, but we're a Shaddoll deck, and this helps us make Shaddolls plays using monsters as materials at "Spell Speed 4".
3 Droplets. Should just be a steple right now if you want to play the game.
3 Secret Village of the Spellcasters. We play maindeck Spellcaster engines to get our cards back online, and we make Winda on our end board, so this is the first spicy floodgate we play.
In the Extra deck 2 Construct. You just need 1 for your turn 1 plays, we aren't a comboish version of the deck, we're trying to reliably make Winda a couple of times and Mechaba once. 2nd is for follow-up. 2 Winda, again I think this is needed for the grind game. 1 Apkallone, this is a negate to back up your plays sometimes, and a tool to send with Nadir Servant other times. 1 Titaniklad, this could come up in some hands but it isn't what we're playing Nadir for. 1 Nt'ss, this is to make the Trap card live. Starving Venom so Super Poly can break boards pretty well using your opponent's monsters. 1 of each Mechaba and Purgatrio. The best Invoked monsters, 1 for going first one for going second. For links we have 1 Artemis and 1 Almiraj. Artemis is important for turning Aleister into a LIGHT monster for Shaddoll plays but also makes him a low-end as a 1 card Mechaba you can run 7 of, and Almiraj means he just as easily accesses Purgatrio. Gravity Controller helps with your Construct combos that make guaranteed Windas. Cross-Sheep could come up in the grind game and be really useful there. Verte Anaconda is really insane in this deck, and necessary for certain opens into Winda 1.
For the side I started with Zombie World. In some matchups this will be better than Secret Village, even if it is worse in most, but it is relatively free in the deck, only impacting access to the Magistus Link 1, and having access to 2 broken floodgates for whichever is better in a matchup seems good. You could even run both going first against Dry, effectively 6 cards that shut down the ritual spell. I initially had the Solemns in the main deck, but I think they're a better side deck plan for this deck than a lot of the better options. We really lack negation, and being able to negate summons and effects could be a really important generic thing to do in matchups where our floodgates aren't effective. Then I threw in Droll and Lancea, high impact hand traps that are specifically good against the best 2 decks and gives us 6 cards to bring in in those respective matchups. Lancea is also good against Virtual World, which is probably the third best deck, and our floodgates are good against Dragon Link.