Soulless Shadow

Dragon Knight of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 4
ATK: 1600
DEF: 1200
Effect: This card cannot be Special Summoned. When this card is Normal Summoned: You can banish 1 "Soulless Shadow" monster from your Deck. Once per turn: You can target 1 monster your opponent controls and flip 3 of your face-up banished "Soulless Shadow" monsters face-down; send that target to the Graveyard.

Dragon Guardian of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 4
ATK: 1200
DEF: 1600
Effect: This card cannot be Special Summoned. When this card is Normal Summoned: You can banish 1 "Soulless Shadow" monster from your Deck. Once per turn: You can target 1 Spell or Trap Card your opponent controls and flip 3 of your face-up banished "Soulless Shadow" monsters face-down; send that target to the Graveyard.

Nomad of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 4
ATK: 1400
DEF: 1000
Effect: During your Main Phase: You can reveal this card in your hand, flip 1 of your face-up banished "Soulless Shadow" monsters face-down, and target 1 of your face-up banished "Soulless Shadow" monsters; Banish this card and add the targeted monster to your hand. You can only activate the effect of "Nomad of Soulless Shadow" once per turn.

The Chained of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 4
ATK: 1600
DEF: 700
Effect: If this card is banished by the effect of a "Soulless Shadow" card: You can flip this card face-down; banish 1 "Soulless Shadow" monster from your Graveyard except "The Chained of Soulless Shadow".

Rampart of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 4
ATK: 1800
DEF: 0
Effect: When this card destroys a monster by battle: You can banish 1 "Soulless Shadow" monster from your hand or Graveyard.

Shell of Soulless Shadow
Type: Fiend/Xyz
Attribute: DARK
Rank: 4
ATK: 2000
DEF: 0
Effect: 2 level 4 "Soulless Shadow" monsters
Once per turn: You can detach 1 Xyz Material from this card; Flip 1 of your face-down banished cards face-up. If this card has no Xyz Materials during your Standby Phase: You can target 1 "Soulless Shadow" monster in your Graveyard; attach it to this card as an Xyz Material.

Death Hell Dragon of Soulless Shadow
Type: Fiend
Attribute: DARK
Level: 8
ATK: 2500
DEF: 2500
Effect: While this card is banished: You can flip 4 of your face-up banished "Soulless Shadow" monsters except this card face-down; Special Summon this card. Each time this card battles a monster: Flip one of your face-down banished cards face-up.

Potential of Shadows
Continuous Spell Card
Effect: During the End Phase of the turn that a face-up "Soulless Shadow" monster(s) activated and resolved its effect(s) successfully: You can flip 1 of your face-down banished cards face-up.

Shadows Reborn
Spell Card
Effect: Flip 4 of your face-up banished "Soulless Shadow" monsters face-down: Special Summon 1 level 4 or lower "Soulless Shadow" monster from your Graveyard.

Aid of the Shadows
Trap Card
Effect: Activate when a "Soulless Shadow" monster is destroyed and sent to the Graveyard: Banish that monster. During your Draw Phase while this card is in your Graveyard: You can flip 2 of your face-up banished "Soulless Shadow" monsters face-down; add this card to your hand instead of conducting your normal draw.

I'm guessing the face down ones are intended to be random, so when you use effects that flip them back up, you don't know which ones are flipping?

It's difficult to explain. In YVD, you know which ones will be flipped because you have to use Sticky Notes to keep track of which ones are flipped.............etrytuviybnl

I don't see people running these due to the complexity and the at that it doesn't work n yvd, I love the concept though