Gamora Stun Gun Headbutt

Here's a simple concept: Gamora doesn't let the villain attack. Ever. While the villain has stars in their eyes, Gamora slowly pulls out her sword, then a her gun, racking up damage all the while.

Minimal upgrades and supports means it'll take a while for her to pump herself up, but this is a stunlock deck. Your allies are there to faceblock during turns when your resources will be devoted to setup cards like Conditioning Room and Keen Instincts. Once her Instincts are honed and she achieves Martial Prowess, you'll have 3 free resources each turn to facilitate the stun/confusion card of your choice. And once her Hand Cannons run out of ammo, it'll be Mean Swing pistol whip time. Also Gamora's Sword slice and dice time. Also Drax face eating time. Rocket Raccoon "so then I started blasting" time. This deck probably sucks.