This deck counters just about everything in the game.
If the opponent is trying to get things destroyed, like Deadpool, slap down Armor to keep them from doing that.
If the opponent is using an On-Reveal deck and trying to set up cards like Wong or Odin, use Cosmo to completely stop them in their tracks.
If the opponent is using Kazar or Blue Marvel, or is trying to set up a bunch of Ongoing effects, hit them with Enchantress to totally shut them down.
If the opponent is trying to set up huge high-power cards, Shang-Chi will yeet them into obloivion.
Killmonger will be good to stop any kind of Flood deck.
Nova is a good setup card for if you want to play a Killmonger later on in the game.
Angela is a really good lane-builder. You should try to play around her as much as possible.
Jessica Jones is a good option for locking down lanes.
Hobgoblin is the Mega Knight of Marvel Snap. Unless it blows up in your face. Which it has for me. Several times. Morph is annoying.
Spider-Woman is good for Flood decks or if your opponent has a bunch of cards in one lane. Her high power makes her a really solid option, even on Turn 6 if you want to. She's a good option to counter Iron Man, too.
America Chavez is just a consistent option to have on Turn 6.
This deck's really fun to use, and you'll feel like an asshole for using it. Have fun!