After seeing the KCI deck tear up modern over the last couple of GPs (and just winning GP Hartford) I'm starting to wonder if the deck might have legs in the format with the best artifacts and mana acceleration. Being vulnerable to counters, graveyard hate, AND artifact destruction is definitely a concern, but I think the shell is powerful enough to overcome this. I don't have a finalized list yet, but would like to go through my thought process for constructing the shell for the Vintage version of the deck
For those unaware, the KCI deck has been revisited in modern because of the discovery of a way to go infinite with KCI, Scrap Trawler, Myr Retriever, and any 1 and 0 mana artifact that is explained in detail here:
Core Combo Pieces:
4 Krark-Clan Ironworks
4 Scrap Trawler
4 Myr Retriever
These are the core cards for going infinite. There is an argument for 3 Myr Retriever but I think it is good enough.
Best Mana Acceleration:
1 Black Lotus
1 Mana Crypt
1 Sol Ring
1 Mana Vault
4 Mishra's Workshop
4 Ancient Tomb
1 Tolarian Academy
Not much to say here. These are simply the best mana accelerants available and the reason to port the deck to Vintage in the first place.
2 mana artifacts:
4 Defense Grid should probably be in the 75 in some configuration. It is the best way to fight countermagic
Ichor Wellspring and Mind Stone are reasonable ways to churn through the deck to find the full combo. Not sure how many we want though. Maybe 4 and 2.
Grim Monolith: This is worth considering but isn't really necessary. The deck has plenty of mana acceleration at 1 and 0 mana
Time Vault (with Voltaic Key): Another consideration but it doesn't actually win the game so I don't think we need it.
Other 1 mana artifacts:
4 Sensei's Divining Top: This is a huge upgrade to Chromatic Sphere and Star, and doesn't require colored mana like Ancient Stirrings. I think we should play 4.
Pyrite Spellbomb: This is a decent way to kill while also having utility against creatures, but requires mox opal or ruby to use the shock. Walking Ballista is usually better but it is good to diversify win cons with things like Surgical Extraction and Phyrexian Revoker / Pithing Needle/ Sorcerous Spyglass in the format. I would play 1.
Skullclamp: I like the idea of playing a 1-2 of these. It is very good with Myr Retriever and Walking Ballista in particular.
Voltaic Key: As stated on Time Vault this probably isn't necessary, although it does have a cute interaction with Sensei's Divining Top to draw more cards.
Other 0 Mana Artifacts:
Mox Opal: We probably want access to some of these for redundancy but perhaps not the full 4
Lion's Eye Diamond: powerful but not necessary. We will hopefully be drawing a lot of cards so saccing LED would be detrimental.
Walking Ballista: The win condition and great utility removal. I would play 3-2.
The only other lands I'd consider are Inventor's Fair and Buried Ruin. We don't intend to take enough turns to want more than 9-12 lands, but if the game gets into a grind fest we might appreciate these.
Overall the biggest issue is that I'm not sure how the deck can fight through graveyard hate. You can't play something like Silent Gravestone because it interferes with your own combo.