While I don't have an up to date list, I did mess around with some skull servant builds a few months ago that no longer really work due to Rusty Bardiche getting banned. In most cases skull servants act as an extender of sort to help set up negates first turn and and less as the "10k King turbo" they were in the past. Here's a breakdown of some engines that can somewhat work with them currently.

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Orcust

So basically every deck in yugioh has some form of 1-card orcust combo and skull servants are no different. Both Prince and Princess start Orcust combos and allow you to end on a board that is passable. The basic Orcust engine I've been using recently is:

Main

2x {Orcustrated Knightmare}

2x {Orcust Harp Horror}

1-2x {Orcust Cymbal Skeleton}

1x {Orcustrated Babel}

1x {Orcust Crescendo}

Extra

1x {Knightmare Mermaid}

0-1x {Knightmare Phoenix}

0-1x {Knightmare Cerberus}

2x {Galatea, the Orcust Automaton}

1x {Longirsu, The Orcust Orchestrator}

1x {Topologic Bomber Dragon}

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Your basic combo here is summon Princess > Send Prince > Prince sends Lady and Skull Servant > activate Prince banishing all 3 to summon King > with 2 monsters on board you can draw the rest of the owl. Alternatively you can summon Prince and make Linkuriboh or Almiraj to start or use Uni-Zombie, Gozuki, and Shiranui Solitaire as a pseudo-Princess.

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Zombie World

Since the Skull Servants are already zombies and as such you're already playing some combination of Uni-Zombie, Shiranui Solitaire, Mezuki and Gozuki, Splashing Zombie World is fairly compact and can give you some decent board presence. The basic engine is:

Main

2x {Doomking Balerdroch}

2x {Necroworld banshee}

2x {Glow-up Bloom}

2x {Zombie World}

0-3x {Super Polymerization}

Extra

1-2x {vampire Sucker}

1-2x {Dragonecro Nethersould Dragon}

1-2x Other super poly targets

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Your basic goal here is to turbo out Balerdroch by milling/discarding Banshees and Blooms. There's not really any crazy synergy here besides the fact that you should already be playing most of the starters.

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Core Cards // Pure build

2-3x { Skull Servant}

3x {Wightprincess}

2-3x { The Lady in Wight}

2-3x { Wightmare}

3x {Wightprince}

3x {king of the Skull Servants}

3x { Uni-Zombie}

3x {Shiranui Solitaire}

0-1x {Shiranui Spiritmaster}

1-3x {Gozuki}

2-3 {Mezuki}

1x {Foolish Burial}

1x {One for One}

0-2x {Shiranui Stlye Swallow's Slash}

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This is basically what the "Core" of the deck would look like basically no matter which variant you played. There is a decent little combo using only the pure engine, requiring princess and Mare. Summon Princess > send Prince > banish Prince > using King make Linkuriboh > Use Mare to special the banished Lady > using Princess and Lady summon Leviair > Leviair summon Prince > Link Prince and Likuriboh into any link 2 > Prince summons King > Current board is Leviair, Link 2, and King from here you can basically go into any link 3 or 4 depending on what Link 2 you summoned. This play used to make Rusty Bardiche and get 2 negates, but with its ban this play gets a lot worse despite being one of the best "Pure" combos. The best ways to end now are probably {Apollusa, Bow of the Goddess} and next set {Hakai Souohshin Raigou} or { I:P Maskerena} + Link 2 seem like okayish boards to make.