Wildcards in Call of Duty: Black Ops 4 allows you to customize your loadout with additional Perks, Weapons, and Weapon Mods that help better suit your playing style.

Primary Overkill
Replace secondary with any primary not in use.
Unlocked: Level 20

Primary Gunfighter 1
Unlocks 1 additional attachment slot for your primary weapon.
Unlocked: Default

Primary Gunfighter 2
Unlocks 1 additional attachment slot for your primary weapon.
Unlocked: Level 23

Primary Gunfighter 3
Unlocks 1 additional attachment slot for your primary weapon.
Unlocked: Level 32

Primary Operator Mod
Unlocks the Operator Mod slot for your primary weapon.
Unlocked: Default

Underkill
Replaces primary with any secondary not in use.
Unlocked: Level 50

Secondary Gunfighter 1
Unlocks 1 additional attachment slot for your Secondary weapon.
Unlocked: Default

Secondary Gunfighter 2
Unlocks 1 additional attachment slot for your Secondary weapon.
Unlocked: Level 26

Secondary Gunfighter 3
Unlocks 1 additional attachment slot for your Secondary weapon.
Unlocked: Level 35

Secondary Operator Mod
Unlocks the Operator Mod slot for your secondary weapon.
Unlocked: Default

Perk 1 Gluttony
Use all three perk slots to select perks from Perk 1.
Unlocked: 38

Perk 2 Gluttony
Use all three perk slots to select perks from Perk 2.
Unlocked: 44

Perk 3 Gluttony
Use all three perk slots to select perks from Perk 3.
Unlocked: 47

Perk 1 Greed
Take a second Perk 1.
Unlocked: 11

Perk 2 Greed
Take a second Perk 2.
Unlocked: 14

Perk 3 Greed
Take a second Perk 3.
Unlocked: 17