The Hood: Gives you the demon and is the best Viper target. Also food for Carnage.
Titania: Beefy 1-drop that has the dual purpose of clogging up a lane and being a last turn play alongside either of the 5s or Shang.
Black Widow: Cuts them off a draw and clogs up their board since they have to play the bite out if they want to draw cards. She's only 1 power, so she's an acceptable Viper/Carnage target.
Carnage: Turns Hood, Black Widow, Debri's rocks, and any opposing garbage/goblins into power.
Daredevil: Solid 2-drop that gives critical info on turn 5 so you can either set up Gamora or clog up lanes.
Mojo: Beefy 2-drop who usually gets proc'd whether the opponent likes it or not.
Viper: Sends over Hood, Widow, Rocks, and sometimes opposing gobilns.
Green Goblin: Staple 3-drop that takes up space on the other side. Turn 4 Titania + GG in a lane with 2 cards in it already is snap worthy.
Debrii: Clogs up lanes really well and combos nicely with Viper and Carnage.
Shang-Chi: Dragons up their ass
Gamora: Stat stick. We're limiting how much space the opponent has to play, so it's not that hard to get Gamora off. Daredevil sets her up nicely, as well.
Spider-Woman: The other Stat stick, being 12 points worth of power if played in a filled up lane, which is often in this deck.