I would play Cavern too. Mental Misstep isn't legal in Legacy.

I might try it in a black monty build to see if it is bad. Maybe like:

Main:
3 Sensei's Divining Top
1 Yawgmoth's Will
3 Grindstone
3 Painter's Servant
1 Demonic Tutor
2 Urborg, Tomb of Yawgmoth
3 Karn, the Great Creator
4 Leyline of the Void
1 Mana Vault
4 Mishra's Workshop
1 Voltaic Key
3 Thoughtseize
1 Tolarian Academy
4 Dark Ritual
2 Helm of Obedience
1 Black Lotus
1 Mana Crypt
1 Mox Emerald
1 Mox Jet
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Sol Ring
1 Necropotence
5 Swamp
1 Wasteland
1 Imperial Seal
1 Strip Mine
2 Polluted Delta
1 Time Vault
2 Scheming Symmetry
1 Vampiric Tutor
1 Demonic Consultation
SB:
1 Witchbane Orb
1 Crucible of Worlds
1 Ensnaring Bridge
1 Spellskite
1 Sorcerous Spyglass
2 Grafdigger's Cage
4 Shatter Assumptions
1 Grindstone
1 Helm of Obedience
1 Painter's Servant
1 Mycosynth Lattice

The thoughts that a proxy change would greatly increase Vintage's footprint are just as flawed as the thoughts that getting rid of the reserve list will cause vintage / legacy to become a premiere format. MTGO helped prove that this theory is false. MTGO proved that the price wall is not limiter as both Vintage and Legacy are, in general, less expensive to play than modern yet the participation levels for modern are exponentially higher. The gains of such a change end up being for a very small subset after the initial curiosity wears down.

As someone who plays every format, I say you hit the nail on the head by calling the set transformative. I think we are just starting to feel the effects of the set and it'll take a long time to fully land in Vintage. I sincerely believe that we may not be in Kansas anymore.

The Halloween thing is disappointing. I hate having to choose to skip Halloween with my family to attend this. I'd pay the extra for a better weekend

I might see how well it works in a 'Dark Times' type build with Crucible and Dark Depths parts.

I would do my best to make it too. I'm in Iowa City so it's not that far a trip for me.

In response to the question, I am enjoying this meta more than I have the average meta over the past few years. A big part of enjoying a meta for me is the feeling that I have some space to brew and be moderately successful.

For me to enjoy Vintage most, here are the main things I want to enable brewing:

• There can't be an option that is so much better as to make all other plans obsolete. This was life in the heavy mentor era. There really were not alternate options to be competitive outside the established pillars. I don't feel like the current meta has a card set that can't be bested. This seems not to be true for shops. I feel for the shops players that like diversity. It's pretty much affinity style or bust - Forgemaster, Stax, Slaver, Welder, etc... are not very viable.

• I want to be able to gain an advantage with cards you might not expect. This is why I despise G-Probe and did a dance of joy when it was restricted.

• I don't want to have to artificially limit my options. This was the case with Chalice and is the case with Misstep. I still feel a bit stifled from this card but the recent disruptors of Hollow One and Lavinia have helped mess with the established pillars enough that there is room to explore.

As much as I would love to see Misstep gone, I have enough options to mix it up.

I enjoyed the show. I watch these anyways but I was really interested to see how all the Lavinia decks played out in this series. My take-away from this session was that while the card might be horrible to play against when it is out, the decks that play a strategy where a hate bear like this makes sense tend to have less dynamic win conditions.