Gamora Counterslash

This deck is meant to be used mostly on Duos with Nebula and, if possible a Justice Nebula.

The first turns will consist of building a nice setup, prioritising Electrostatic Armor and Gamora's Sword. You'll want to buff up your DEF too, as that is what will pay off the most when it comes to blocking villain strikes and sometimes even minion attacks, but the latter can be prevented with First Hit, which is a good thing to do as it triggers Gamora's and her Sword's response, dealing extra damage and removing threat.

Staying on max Health is one of your priorities, as Fighting Fit gets the most damage when used on max (or starting max, since you can get more with Endurance) health. Also try not to go to Alter Ego too much, as your hand will likely be useless, with the exception of some Upgrades or Events that you can use on your next turn, if you get a lot of Defense events you'll have a rough turn.

Next priority is defending almost every single attack. Unless you have Crosscounter, you don't wanna recieve an undefended attack, because most of your cards do things when the villain attacks you, and you can even trigger his attack with Toe to Toe. Counter-Punch and True Grit are great cards to use when defending, specially on Villain Phase, as it allows to trigger Gamora's response on both phases. Booster Boots are useful, but try to use them wisely, and mostly once you've got the "good" upgrades on your setup, as you have the chance to lose those upgrades and have to wait a full shuffle to get them again.

Another thing to note is that this deck lacks on Thwarts, and you'll likely be on your toes when it comes to a solo game, you can include more, but since this is based for Multiplayer, you should try to rely the Thwarting to another Hero and focus on defending and counter-attacking. Remove Daughters of Thanos when not playing with a Nebula Hero as when you draw it it will likely not be when you have Nebula as an ally on the table.

This deck works very well on Ultron as it allows to control the drones by using the sword after you've done a Counter-Punch or a Crosscounter on the Villain's attack.