Lair of Darkness thoughts so far.

Doing a short discussion on how every card from the deck has been treating me.

Lair of Darkness.
The good thing about this card is that it lets you tribute a monster, to activate effects not for a tribute summon. What I don't like is that it summons tokens to the turn's player. (during the end phase)
If a tribute(s) happen on your turn, you get tokens. On your opponent's turn, they get tokens.
And while you may think well then they have more things I can tribute...Usually it's as a win more mechanic because your opponent has no field/hand and can't put something on board to tribute and you want to advance the gamestate even though you could just attack. "With no monsters left on the field, I summon dark magician"
Sometimes it's a way to block link zones, but most of the time you're just giving your opponent a way to block damage. (but you still take the damage! yeah not this time) 9/10 times if you've attacked the hand and field to cripple your opponent there's no point putting tokens on their field.
The worst part about this card is that it activates to summon, now that sounds benign, but the amount of times I got ogre'd on my EP, shrek would be proud.

Ahrima, king of wickedness.
Name sounds impressive but he's not that amazing. On paper he's really good but because of the way diabolos works he's a glorified terraforming, if he could add lair from the GY or deck, I would say 10/10 but he doesn't do that. When I do summon him he's an upstart or a rota for some dark monsters if I tribute something other than itself. And he can summon diabolos if I tribute another monster I control, but not when tributing a monster my opponent controls. Tributing another monster does not happen often with ahrima but when I do I often search malefic stardust to protect lair. You could search your favourite not yet banned card astrograph from the deck with him. Decent not diabolos targets could be world crown, infernity patriarch, zerato, cusillu, pendragon, radian.. and a couple more.

Duke Shade, king of Umbra.
This card, the way he was intended to work was brilliant. But in reality he's shit. You're supposed to see him as a universal virus target depending on how many tributes you give him. 0-6 ffv, 0-1 ccv, 3 ddv, 4 eev. That all sounds fine, but if you're actually playing the game 3+ tributes is not going to happen to swing the duel in your favour. He's a recycler and win more card for the most part. Usually if you summon him you get to summon diabolos from the grave while adding him to the hand and if you do that diabolos doesn't summon if you chain it wrong :), instead what you can do is play one of the above mentioned ahrima targets and use duke to recycle one of them. Especially duke+radian is a nice combo with lair on the field. You can kajiu your opponent, then use duke to tribute and add the same radian back to the hand for 2+ tokens during your EP.

Lilith, lady of busted card design.
The obvious star of the deck, this card is so good you can run her in any deck that runs 3+ traps and doesn't normal too much. Searches any normal trap, that should say enough. I've seen people play this in their artifact engine to search sanctum. Normal lilith, set scythe. Rip extra deck. But back to the virus deck, she tributes as a cost which is the best kind of monster removal as it does not target or destroy, you can also keep using her if she has her effect negated by tour guide or other effects. You'll want her on the field as long as possible because she wins you the game. Going back to the shitty part of lair of darkness, I play metaverse instead of terraforming so I can get another one up during my opponent's turn and use lilith to deal with a problem card.

Darkest Diabolos, lord of the lair.
He can be played in some other decks, and most people call him the anti kaiju, which is kinda right...but I think he's not all that great. Yes he has 3k atk, yes your opponent can't tribute him, yes he can't be targeted, but that you can't special summon him with his own effect unless the tribute comes from your field is so stupid...konami please? Anyway, his untopdeck effect is fine, if your opponent still has a hand by the time you get him out, he's mostly a beatstick though. He's ok to have, but I'd rather have lilith on the field.

Grave grinning virus.
With this card there's only 1 more "drawback" criteria the virus cards have, that's >1500 def. This one doesn't attack the hand on resolution which makes it useless if you resolve dvd and ddv within 2 turns because those attack all monsters. If you only resolve ccv and ddv then ggv can be used to attack all monsters with >1500 ATK in hand. 3 cards, 3 turns. and fang of critias isn't searchable so it's a little bit more consistent if you open 2 virus cards but the chances of opening lilith, lair/ahrima, diabolos/foolish/d shrine and 2/3 virusses is very slim. Overall it's a nice addition but you'll still need the other virus cards to prevent your opponent from playing yugioh first turn.

Maiden variant, this works decently. You sacrifice your lilith normal summon to get brandish maiden out which tributes itself to get you a token and a link monster, which when destroyed summons maiden again so you can tribute for another link maiden. It's generally stally and it's an ok token generator but normal summoning this if you have lilith in hand is very often not a good option.

Noid variant, if ahrima could recover lair from the grave this variant would be so good, and it is good as long as you can get to lair, tributing their monsters to negate something is really powerful. Problem with how noids work is that they dump cards and it really sucks if your reasoning or monster gate dumps any copies of lair. And it happens often I go through all 3 lairs when I'm not nuking all monsters before the end of the 2nd turn. It adds a lot of early power but if your opponent manages to bite through you're usually not going to be able to recover from it.