I made this deck as a meme, but it somehow ended up being one of my biggest cube winners. Initially I had Quake over Jeff, but she didn't end up useful enough, hence the swap. You could probably play something else in that slot over Jeff, but I'm trying Jeff for now to abuse locked locations. Other options would be Cable or Mirage for the information.
At the time of writing, the top deck in the meta is Husky's Agatha, which was not the case when I made the deck last season, so Ham would likely be better as Iceman or Silver Sable, but for now I'm keeping Ham because the information he provides along with Copycat tends to be crucial in the decision-making necessary to play this deck properly. That's also why I have been considering Cable or Mirage over Jeff, but I wanna try Jeff first. (Do let me know if you change it and how it feels though!)
This deck is very skill-testing, and will flop hard if you aren't familiar with the decks people play in whatever your pocket meta is. Most of the points here come from correctly predicting what your opponent will do. It's a bit like Sera Control, but a lot more unpredictable. No one really understands what you're playing, and will have a hard time playing around you.
Information Gatherers:
As previously mentioned, Ham and Copycat are mostly for information gathering. Make sure to check the opponent's hand at the start so you don't Ham their Agatha. Otherwise, Ham away! Copycat is just generally great, since you know what card your opponent will not draw, informing you of what they may have in hand. Her surprise factor and high cube equity are overall amazing, and worst case you just play her for points, which never really feels bad.
Lane Control:
Widow into Negasonic can often disrupt a lane enough that your opponent will have to either double down on it or focus their attention elsewhere. Or you can hold Negasonic for turn 5 to disrupt their T6 plays (or play her on 6 on the rare occasion you have prio). Juggernaut further plays into this line, since it will be more obvious what your opponent will do after that play, so you can Jugg their play out of the Widow/Nega lane, maintaining the debuff and sometimes even maintaining Nega's ability, making it hard or impossible to contest the lane, even with that small of a power investment. You can sometimes also Jugg things into Negasonic, though that isn't really something you should bank on.
Tech Choices:
The rest of the tech cards should be pretty self-explanatory. Shadow King for the Ebony Blades, Torches, Daggers, Symbiotes, and just a generally good card to have in general. You can also SK their Pig to 0 if they play it. Shang is just always great, but especially so in this current meta where Agatha is everywhere, Infinauts are common, movers scale huge, and so on. Red Guardian is just a great catch-all tech card that can play for good points, which this deck does need. You can try other things as the meta shifts, but I think this trio is the sweet spot.
Location Control:
Legion, Nocturne, and Jeff are the location package, allowing you to scam out a lot of cubes. People are expecting Legion a lot more nowadays, but I don't think most people expect it from this deck in particular. Nocturne and Jeff moving is huge and can win a lot of locations, not much to explain there. Nocturne can often scam some wins, but she's also great in assisting Legion by fishing for scam locations. Worst case, Nocturne and Jeff play for okay points and add ambiguity to turn 6, synergizing well with Negasonic and Shang in making up a point differential you may otherwise not have been able to meet.
The Wildcard:
Last but not least is one of the most slept on cards in Snap - Hulkling. Despite being seen as a meme, this dude will legitimately juice a lot of cubes out of unsuspecting opponents over a decent sample size. People don't expect him or respect him, which we can use to our advantage. Sure, sometimes he will be a vanilla 6/11, and on the rare occasion he will be a dud or detrimental to play, but there are a surprising amount of high rolls to be had with this card. In a deck like this, where you are fishing for high cube wins, and where people often snap into you, he is right at home. Give him a chance! If you don't have him, Magneto would probably be a decent replacement, but expect the cube equity of the deck to go down.
Let me know if you try the deck and how it feels, or any replacements you make or insights you may have.