Cards is a gameplay feature in Back 4 Blood. This "roguelike" card system allow to create different experiences each and every time, putting players in control to craft custom decks, roll different builds, and undertake more demanding fights. There are Corruption Cards chosen by the Director and Active Cards that offer the players an opportunity to pick some useful special perks. In the cooperative modes, players unlock additional cards from the Supply Lines system. For PvP, all players always have all cards unlocked for fairness.
Active cards[]
After the Director picks their cards, players will play their cards. Active Cards allow the player to pick various special perks which can be broken up into four categories called "Reflex" (blue), "Discipline" (red), "Brawn" (green), and "Fortune" (yellow). The cards are also split into seven types: Offense, Defense, Utility, Mobility, Ability, Stat, and Talent.
Burn Cards[]
Burn Cards are a new type of card added with the December 2021 patch.
These cards are available through the Roving Merchants Supply Lines and can be played in each Saferoom to gain temporary effects like instant healing, currency boosts, increasing resistances, and more.
Once a Burn card has been played the players can no longer change their Burn Card.
Furthermore, if a level is repeated by a continue, players who already used a Burn Card in this level are no longer able to play another Burn Card.
There are currently 27 different Burn Cards available which are designed to shift the fight against the Ridden in favor for the Cleaners.
Corruption Cards[]
The Director draws unique cards at the outset of every single level. Corruption cards apply various randomized game parameters related to the Ridden, the weather, etc, and these cards stack additional dangers with every passing chapter.
Food Cards[]
Food Cards are a type of card that can be obtained by interacting with items during a mission. These cards have been added with Patch 1.10. These cards can stack and last for the duration of one Mission. Alongside these cards a dedicated Scavenger Card has been added to the game. There are currently five different types of Food Cards available.
Legendary Cards[]
Legendary Cards are a type of intel that can be obtained by interacting with the Legendary Intel Box, which is a black and gold box with a gold skull on it, during a mission. These boxes will grant a Legendary Card which all have a 
Team Effect. No Copper is needed to acquire the cards, as is the case with the regular Intel Shrines.