From what I've seen, Lavinia is only really good against Outcome. Maybe it isnt even needed? Yes I understand playing 1 Underground Sea for the trifecta: Demonic Tutor, Vampiric Tutor and Yawgmoth's Will seems quite easy.

So here is a list I'm wondering if any Outcome grinders would provide some thoughts on, it's still UW:

Mana (25):
4 Flooded Strand
1 Polluted Delta
3 Tundra
2 Island
1 Karakas
Tolarian Academy
Library of Alexandria
2 Mox Opal
Black Lotus
Mana Crypt
Mana Vault
Sol Ring
Mox Sapphire
Mox Jet
Mox Emerald
Mox Ruby
Mox Pearl
Lotus Petal

Creatures (4):
2 Lavinia, Azorius Renegade
1 Snapcaster Mage
Monastery Mentor

Draw/Tutor/Power (23):
4 Paradoxical Outcome
4 Preordain
2 Sensei's Divining Top
1 Voltaic Key
Ponder
Gitaxian Probe
Ancestral Recall
Brainstorm
Dig Through Time
Treasure Cruise
Timetwister
Merchant Scroll
Mystical Tutor
Mind's Desire
Time Walk
Time Vault

Permission (6):
4 Force of Will
2 Flusterstorm

Removal (2):
1 Repeal
1 Hurkyl's Recall

Sideboard:
4 Tormod's Crypt
3 Hurkyl's Recall
2 Karn, Scion of Urza
1 Lavinia, Azorius Renegade
1 Flusterstorm
1 Island
1 Blightsteel Colossus
Tinker
Balance

I wonder if this list is good? What would you cut? Add?

Have you ever considered Aether Flash for the Xerox, Shops and Dredge matchups? Card seems quite absurd. Obviously it doesnt work with Pyromancer very well but maybe just play a hard control deck that wins with Niv Mizzet?

I would say go with UW, better manabase against Workshops and other Wasteland decks in general. Stony over Null Rod, it's harder to remove. Sol Ring is not good, if you want unpowered, I wouldn't try to play Lotus Petal or other artifact mana. A card that might actually be good in Landstill is Lavinia, Azorius Renegade, but I'm not sure. It fits in with the mana denial portion of the deck very well.

So I was brewing and came up with the following list and I believe it is viable in the current metagame and have explanations as to why I believe so. Let me begin with the list:

Mana (22):
8 Island
3 Polluted Delta
3 Flooded Strand
Library of Alexandria
Black Lotus
Sol Ring
Mox Sapphire
Mox Jet
Mox Emerald
Mox Ruby
Mox Pearl

Draw (7):
4 Preordain
1 Search for Azcanta
Ancestral Recall
Dig Through Time

Counterspell Package (14):
4 Force of Will
4 Mental Misstep
4 Mana Drain
2 Mindbreak Trap

Removal (3):
3 Repeal

Vintage Hate Package (8):
3 Propoganda
3 Null Rod
2 Back to Basics

Win the Game (6):
3 Consecrated Sphinx
2 Jace, the Mind Sculptor
Time Walk

Sideboard:
4 Tormod's Crypt
3 Energy Flux
3 The Tabernacle at Pendrell Vale
2 Mindbreak Trap
2 Arcane Laboratory
1 Propoganda

I came to the realization that current Pitch Dredge have a hard time with a resolved Propaganda, Game 1 it is actually an auto win against them.
Consecrated Sphinx seems like a pretty strong card against decks like Xerox as well as Outcome.
Having a single colored manabase makes this deck pretty strong against Wasteland based decks.
BACK to BASICS is a HOUSE! Especially combined with your "taxing" cards (Propaganda, Energy Flux, Tabernacle at Pendrell Vale).
I'm not sure how good Search for Azcanta is in this deck but it seems quite good in a hard control deck like this.
What does everyone think of this brew? Do you think its viable?

Yes because this was when we played lands in our main deck. I believe he had 4 Undiscovered Paradise as well as Mana Confluence.

Yes, I remember Mark's list, he ran 4 Cavern, 4 Harbinger, 4 Chewer, 3 Wispmare as his board. The idea seems good but I feel Lance aka vaughnbros hit the nail on the head with the format being too fast for this plan.

Is Spinning Darkness even playable anymore? Decks that play Priest probably also play Lavinia, and that just makes me sad lol

That's what I was afraid of. I finally have a full set of power on mtgo, not sure what to do with it lol. DPS seems like an idea actually. The list I had in mind was Esper so that I could play Lavinia but I'm not sure if that is worth it... here is what I threw together:

Mana (29):
1 Karakas
2 Tundra
1 Underground Sea
2 Scrubland
1 Swamp
4 Marsh Flats
1 Flooded Strand
Tolarian Academy
Black Lotus
Mana Crypt
Mana Vault
Sol Ring
Mox Sapphire
Mox Jet
Mox Emerald
Mox Ruby
Mox Pearl
Lotus Petal
4 Dark Ritual
2 Cabal Ritual

Draw/Tutor (18):
4 Preordain
4 Dark Petition
2 Yawgmoth's Bargain
Timetwister
Ancestral Recall
Brainstorm
Ponder
Gitaxian Probe
Mystical Tutor
Demonic Tutor
Vampiric Tutor

Win the Game (4):
Time Walk
Monastery Mentor
Yawgmoth's Will
1 Tendrils of Agony

Disruption (7):
4 Duress
3 Lavinia, Azorius Renegade

Removal (2):
1 Chain of Vapor
1 Hurkyl's Recall

Sideboard:
4 Tormod's Crypt
4 Fragmentize
3 Hurkyl's Recall
2 Kambal, Consul of Allocation
1 Bontu's Last Reckoning
1 Plains

No I do not, sadly. I wonder if picking up the cards to play DPS would just be better right now, since DPS doesnt get hit by the stuff that current Xerox decks are doing to handle current combo decks.