I played this to infinite this season (Feb 2023) and thought I'd share.
Each card in the deck fits a very specific purpose that make the deck near impossible to beat when your combo pieces are assembled, it's usually clear how the game will play out by the time the 3rd location flips over so it's very easy to know when to snap and when to leave.
Wasp & Yellowjacket - Both of these cards let you do one of two things: primarily, they let you play 3 cards on turn 6 with only 6 mana available to ensure that you win with Valkyrie. Additionally, they can be played on turn 2 with Adam Warlock (usually right, on the unrevealed location) to cycle through your deck.
Ant-Man & Titania - Since both of these cards are 1 mana and more than 3 power, you can play them with Valkyrie on turn 6 to almost guarantee that you win a single location.
Adam Warlock - Probably the weakest card in the deck and a pretty big tell that you're playing Galactus. That said, the most important thing in this deck is assembling your combo pieces and since there aren't many options to do that in Snap, he makes the cut anyway.
Psylocke, Electro, & Wave - These allow you to play Galactus before turn 6, if you can't do that you've got very little chance of actually winning the game.
_Valkyrie _ - The 2nd most important card in the deck for obvious reasons.
Doctor Octopus - Can be used on 4 after Electro to pull cards out of your opponents hand to limit their options after you Galactus or on 5 After you Wave out Galactus on 4 to fill the location and give you perfect information.
Galactus - Why try and win two locations when you can win with only one?
_America Chavez _ - Despite the fact that you rarely play her, America is easily the 3rd best card in the deck. Having an 11 card deck for the first 5 turns significantly improves the chance of you drawing your combo pieces by the time you need them. Yes it reduces the likelihood of you drawing Valkyrie on 6, but drawing Galactus by 5 is significantly more important.