Phoenix/Barrett-focused SR build with any fast-firing 2ndary (not Magnum/Deagle/Belgian), versatility cards in the latter half of the deck.
Base DMG: 1.3*1.15 = 1.495 = +49.5% regular DMG (all base DMG and bullet DMG cards)
Weakspot: 1.75* 1.15 = 2.0125 = +101.25% weakspot DMG (all weakspot and bullet DMG cards)
Key Attachments: Suppressor/Long Barrel, HP Ammo/Fast Mag, ACOG/High Zoom, and Tac Stock.
-You could switch out Superior Cardio for Energy Drink to trade stamina efficiency for more versatility.