BD(C)M - 19th @ 2023-10 AMT

Big Deal the (Contract/Cerebral/Clearinghouse), then Moon pool

The baseline combo goes like this:
1. Assemble a hand of Extract, Big Deal, Reconstruction Contract and any 2 agendas. The combo costs 15 from here. You'd also want to have any 4-cost ice rezzed, have a remote with at least 1 ice or a Formicary hiding somewhere on the board, and a piece of advanceable ice installed somewhere on the board (these can be the same pieces of ice, for example an Ice Wall installed on the remote). Although this technically is a 5 card combo, it's easy enough to find those moving parts because of tutor and redundancy.
Use Pivots to search for your operations on the previous turns and keep HQ secure.
2. Install Reconstruction Contract in the iced remote, Extract a different 4-cost piece of ice to find Moon Pool and install that on the board, Big Deal the ReCoCo. End turn.
3.1. If they run the Reconstruction Contract, after they commit to access, use Moon Pool to trash 2 agendas from HQ and add 2 more advancement counters on the ReCoCo, for a total of 6. You can use Moon Pool at any paid ability window, it doesn't make a difference. Proceed to use the ReCoCo's ability before they access. It gets interrupted by Ob trigger which lets you put a Cerebral Overwriter on the board (has to be the same iced remote, and you have to have another advanceable piece of ice as a valid ReCoCo target to start the combo). Then put 6 advancement counters on the Cerebral, and they have to access it. Pay 3, either they die on the spot, or die by the end of their turn due to having -1 handsize.
3.2. If they don't run the remote, repeat the shenanigans described above, but pull out a Clearinghouse with 6 advancements before the start of your turn.

Doesn't it lose to Pinhole Threading?
That's why we keep a clean board. You shouldn't have any extra assets installed at the point of the combo, or else the Runner might access that asset instead of your Cerebral Overwriter. You can keep Spin Doctors: those can be removed at instant speed in case of a Pinhole to clear the board. Conversely, if the Runner commits to access with a Pinhole, they have to access your only card in a root of a server: the effect is mandatory.

Doesn't it lose to Light the Fire!?
Make sure to have a Border Control on the remote if you suspect LtF. Do not search for anything with Ob when you pop it though, just end the run.

Could you use Mitosis instead of Moon Pool?
You sure could, but it's 1 more influence and loses to LtF 100% of the time. You'd also have to start the combo from 25 credits without the Extract boost. Might be worth it to stop clogging your hand with agendas? That build would probably work best from a 59 card deck.

Doesn't it lose to Stoneship Chart Room, Flip Switch, Audrey v2+Steelskin Scarring, giant handsize, etc?
Ok, you got me. Most of those didn't stop @Sokka from winning Worlds with a Clearinghouse deck though.

The deck is posted as proof of concept. It might lack competitive consistency, has some questionable omissions and inclusions as a byproduct of being a test build. Punitive Counterstrike is hard to pull off consistently, you sometimes get extra flooded so Drudge Work could help, running real sentries like Stavka and Winchester might increase the winrate. I leave it to the reader to figure out.