Affinity is a feature that affects any card from the Renegade edition and beyond, enabling them to have slightly different traits and thus creating two types of the same card.
They effectively modify some aspect of a card to make it align more towards one element, adding increased strategic value to a card that would normally be more mundane.
A prime example is thewhich can have either a red or green affinity, which alters its Company passive. Affinities are not set in stone on their effects however, as some affinities provide effects that don't make sense with their actual element.
Affinities come in four types, indicated by a respectively colored orb in the center of the card's right frame. Additionally, the part of the card indicating its power cost and orb requirements is having a similarly colored overlay, and affinity specific abilities have recolored icons as shown below.
There are some cards that specifically interact with other cards based on their affinities.