Marked for Death (+10% Damage on tag) and Shredder (+1% Damage per hit, up to 15%) adds +25% Team damage
Money Grubbers is a very useful scavenge card that lets you gain lots of extra copper and Weapon Scavenger lets you get the AR and upgraded tier you want for it
Run like hell +12% Movement speed still very useful for repositioning (Unless you get hit) and comboed with Mad Dash lets you get great speed and distance - although mad dash should be incorporated after you're comfortable with your DPS/Handling cards
Hyper-Focused is your biggest damage increase but will tie you down, so Hunker down plays into that to increase accuracy making it easier to fire
Cold Brew Coffee and Line em up adds a LOT of quality of life handling, play the one you want to prioritize first and then you can add the support cards (magwell +30% Reload, Tactical Vest for extra damage and ammo, Ammo mule for extra Ammo)
Silver Bullets and Large caliber rounds can be rearranged to be added earlier, they're just great DPS/hoard clearing cards (200% penetration) and is a nice DPS increase that also increases stumble
Highly recommend using scar or RPK, both of which have high DPS and damage per shot allowing you to make use of the fast reload speed and handling of this deck and the massive DPS boost will be giving you lots of hoard clear and mutation killing capabilities