A lean, mean, fighting machine

Armed and Dangerous

With Winter Soldier being rewarded for taking out minions, doing so with consistent overkill will make him an even more efficient killing machine. To help with this is the Hand Cannon and Bambino, making sure you can always get the overkill keyword. Leo Fitz and Jemma Simmons will make sure that you always have access to at least 1 gun. Winter Rifle helps boost the damage even more, and helps ignore retaliate and tough, meaning nothing will stop your massive attack. Combat Training and Combat Specialist will give you a solid 4 attack, which will become 11 with the Hand Cannon, Bambino, and Winter Rifle, enough to defeat most minions with atleast 1 excess damage. Follow Through will increase the excess damage, which will guarantee that every turn you are removing threat, defeating the minion, and substantially damaging the villain all at once.

Relentless Assassin

Now that we have a good source of damage to defeat anything in front of us, we need to make sure we have enough minions to actually keep defeating them. Safe House #30 will of course get you some minions in alter ego, Looking for Trouble will help remove some threat from the main scheme so you can use Lethal Protector for side schemes, and Spoiling for a Fight will ready you so you can instantly defeat it with your Hand Cannons and Bambino. Winter Mask will draw you a card whenever you defeat a minion, and you'll build up tokens on Hall of Heroes so you'll have even more cards available when you have to drop down to alter ego.

Enhanced Durability

Now that we have a good amount of threat removal and great damage, the only thing that would stop this build is getting slowed down by being forced into alter ego, or getting stunned. To prevent having to swap too often due to damage Symbiote Suit will add 10 health, and as a bonus +1 to attack to make sure the overkill damage will be even higher. With his Winter Armor he'll have even more than enough health to sustain through most villain and minion attacks for a while, whilst also making stuns less frequent. And now with a large amount of health we can use Moment of Triumph to heal up when we defeat the minions with a bunch of excess damage, making it pretty safe to keep taking damage.

Ceaseless Charge

With the Cybernetic Arm, Winter Soldier is going to be able to play a lot of events and since the aspect cards are really cheap it can be used exclusively on his own events. Adding Martial Prowess will essentially give him 2 free resources for his attack events, making it really easy to play multiple minion summoning cards and still be sure you can defeat them all in the same turn. Anything that is still too expensive can be made a lot cheaper with Man on the Wall, due to all the minions you'll have in front of you. Allowing you to unleash the devastating power of his bionic arm.