Overall Viability? Definitely not. Many of these cards actually benefit from their destruction/being sent. If a DARK monster(s) you control is Tributed (except during the Damage Step): You can Special Summon this card from your GY (if it was there when youTributed) or hand (even if not). Declare 1 card name; if that card is in your opponent's hand, they must discard all copies of it, otherwise you discard 1 random card. Pretty much all of your monsters are 3000 or less to fulfill the requirements, although you would probably want to tribute a monster with 2000 or more ATK to get its second lingering effect. In that case, you can tribute SS’d Lilith, Darkest Diabolos, or an unnaturally beefy Duke Shade Tribute 1 DARK monster with 2000 or more ATK; look at your opponent's hand, all monsters they control, and all cards they draw until the end of their 3rd turn after this card's activation, and destroy all those monsters with 1500 or less ATK.

This card cannot be Special Summoned. While this card is on the field, neither player can Special Summon monsters.

Structure Deck: Lair of Darkness

When you Normal Summon this card, remove from play any number of DARK monsters in your Graveyard. This card gains 400 ATK for each removed card, until the end of this turn.

The use of Mind Crash is in my opinion mandatory, since it can be chained at Crash Card Virus or Epidemic Eradicator Virus to Complete the hand control opera. Basically any monster and the tokens are good fodders for CCV and all our big beaters, but also the super poly targets, are good for EEV. Discard 2 cards, then target 1 Trap in your GY; Set that target. It can be activated this turn. You can only activate 1 "Boogie Trap" per turn.

Wisdom-Eye, Harmonizing Magician, Purple Poison, Dragonpit, Pendulum Sorcerer, Stargazer, Timegazer, Gate Infinity, Gate Zero, Each turn, 1 Level 5 or higher Fiend-Type monster you Normal Summon can be Summoned without Tributing. If exactly 1 Normal Summoned/Set Level 5 or higher Fiend-Type monster (and no other cards) would be destroyed, you can send this card to the Graveyard instead. I hope you will enjoy this version. I have many others, but I think this one is the one that will benefit the most from Piris Reis Map and Small World once they are available. You can Normal Summon this card without Tributing. Once per turn, during the End Phase, if this card was Summoned this way: Destroy this card, and if you do, take 1000 damage. Activate only by paying 1000 Life Points while you have 3000 Life Points or less. Select a Normal Trap Card in your Graveyard. This card's effect is the same as that Trap Card's. Remove from play that Normal Trap Card.

Overall Viability? Worth it. Call spells and hit their Invocations before they even get to play them. Overall Viability? I have yet to test it, but this sounds like a great idea. You get rid of their combo pieces and fight against the totally not broken Droll/Reincarnation combo. You can Tribute any number of DARK monsters; Special Summon this card from your hand, and if you do, it gains 500 ATK for each monster you Tributed. If this card is Normal or Special Summoned: You can target 1 Level 5 or higher DARK monster in your GY; add it to your hand. You can only use each effect of "Duke Shade, the Sinister Shadow Lord" once per turn. You cannot Special Summon monsters the turn you activate either of this card's effects, except DARK monsters. Overall Viability? Definitely worth it. Call spells, but I’m not sure if you’d want to wait for them to have their scales set up. SPELLS: Allure of Darkness, Enemy Controller, Monster Gate, Lair of Darkness, Terraforming, Foolish Burial, Twin TwistersAll face-up monsters on the field become DARK. Once per turn, if you would Tribute a monster you control to activate a card effect, you can Tribute 1 DARK monster your opponent controls, even though you do not control it. Once per turn, during the End Phase: Special Summon as many "Torment Tokens" (Fiend/DARK/Level 3/ATK 1000/DEF 1000) as possible to the turn player's field in Defense Position, up to the number of monsters Tributed this turn while this card was face-up. SPELLS: Cosmic Cyclone, Pot of Desires, Raigeki, Scapegoat, Terraforming, Dark Hole, Pot of Duality, Called by the Grave, MST, Forbidden Chalice, Monster Reborn, Overall Viability? Definitely worth it. You could call either Spells or Traps and be good. However, it seems like they get the most benefit from spells so you might want to call those. Unless you have a huge grudge against Reincarnation like I do haha