As has been mentioned before, managing cards in hand is one of the crucial resource-allocation decisions players face when playing House of Cards. They literally represent your ability to act or resist being acted upon. Given this situation, how does one keep from being overwhelmed at the first sign of opposition?
The game adopts the conceit that the unseen forces surrounding a Bearer tend to congregate around like patterns. What this means in practical terms is that using cards to act “correctly” leads to replenishing the card after it is used. When using a card of the proper suit for an action (such as Cups for a social interaction), the player gets to draw a new card from the deck to replace it immediately. The four suits represent very imminent physical matters and concerns: the four elements, mortal professions, and other terrestrial forces, and so their ebb and flow is visible to the casual observer.
On another level, characters who act in accordance with their Archetype for an entire scene get to refill their hand at the end of the scene. Why only at the end of a scene? Because Archetypes operate on grander cosmic scales, and as such are far more interested in patterns of behavior over time than in momentary behavior. (On a meta-textual level, this was a conscious design decision intended to circumvent a perceived problem in some games featuring reward systems for playing in-character that in practice only require players to toss in the occasional action to “hit the button” and get the benefit.)