Breakdown of every card chosen for this deck:
Nebula: Arguably the best 1-drop in the game. Just her existing on the board forces the opponent to make awkward decisions, which include playing into her lane, which is wonderful news for Red Guardian and Negasonic. Can be used as a target for Blink in dire scenarios but it's not ideal.
Nightcrawler: In my opinion, he's also one of the best 1-drops in the game. This deck needs at least two 1-drops to have an efficient curve and he is by far the best fit. You can afford to play him later (T4, T5, T6) without issue which is key for keeping a nice curve (anti Red-Hulk) and a failsafe target for Blink. On-demand move is also just extremelly good in general for plenty of reasons. Also worth mentioning the Blink synergy, we can move him to a more convinient location before he's swapped with a bigger card.
Domino: If any youtuber/streamer tells you Domino is bad they are wrong and I suggest you should stop parroting their opinions. "But what about White Widow, Jeff, Quake or (insert any good 2-drop here)?" Yeah they are all good cards, but Domino in this deck accomplishes something more valuable than any of what any other 2-drop can offer and that is: it increases the odds of keeping our expensive cards in our deck until later so we can cheat them with Jubilee and Blink, she's a guaranteed play on 2 that helps us win prio so we can snipe Angela/Thena/Jeff/etc. with Red Guardian or Negasonic, which also guarantees we deny Red-Hulk from growing, and she allows us to make our deck more top-heavy without having to worry about losing tempo.
Negasonic: Excellent synergy with both Nebula and Blink (once she's been activated that is). There really isn't that much more to it apart from the fact she's a really uncommon card that nobody plays around. And depending on the deck you are up-against she can also create surprisingly easy "checkmate" scenarios in your favor.
Red Guardian: Most versatile tech card in the game, bar none. Specially strong in a meta filled with Angela-shells, Ravonna, Jeff, etc. because you can play him on-curve and deny a ton of value from the opponent. Even just playing him as an effective 3/5 is worth it because he basically leaves 2 power behind if switched with Blink. Phenomenal card.
Nocturne: I said on-demand movers are really good right? Well how about a 5 power mover that can also snipe Limbo away from all the stupid Magik T7 combo decks that are also quite common in the meta? She's just an extremelly handy 3-drop, and she isn't the worst Blink target either.
Jubilee: I shouldn't have to explain why she has excellent synergy with higher curve decks and Blink in particular right? And she's also the only 4-drop in our deck, which means odds are your 3-drops will turn into a 5-6 drop with Blink.
Klaw: Consistent 5/12 across two lanes with 0 set-up requiered is just really good, specially if cheated via Blink/Jubilee. Only caveat is being careful about dropping your Jubilee and/or swapped card in the right lane if he's still in your deck.
Leech: I hate this motherfucker with a burning passion and I don't know why the fuck Second Dinner thinks it's ok that he's been buffed to a 5/5. But you know what, the meta just has so much solitaire bullshit that auto-wins T6 with a ridiculously strong on-reveal (Cannonball, Hela, some bounce decks, etc.) that I don't feel bad about playing him. And the fact he guarantees a 6-drop with Blink is just icing on the cake.
Blink: The key combo piece of the deck, although it's still fairly functional without her by virtue of just having good stat allocation and pretty high disruption. That being said, yeah, playing Blink increases the value you can get out of your "powerful effect but low power" cards by an extremelly significant amount.
Doctor Doom: We don't have Red Hulk, we hate Red Hulk, and I don't think I would play him in his place anyways because our two movers + Klaw means we generally win by spreading our power across 2-3 lanes. Doom just works really well for that and he's nowhere near as telegraphed while also not being a glaring Shang Chi/Cannonball target if cheated early. Maybe it's just me yapping and coping because I don't own Rhulk but Doom worked really well for me.
Magneto: Quintessential 6-drop of the game. Decent power for the cost and excellent disruption which still catches people off-guard. Really good if cheated by Jubilee/Blink and good if played on T6. Not much else can be said, you know what he does.
Spiderman
Polaris
Rogue
Scarlet Witch