Sorare Card Scores (SC) are calculated by taking the Player Score and adding any score bonus that this card may have - for example, Captains can receive score bonuses of 0%, 20% or 50% (depending on the competition entered), cards from an ongoing season receive score bonuses of 5%, and other cards can earn additional score bonuses if they have been trained.
For example, if you have a card with a 10% bonus and this player has obtained a Player Score of 70, the Card Score would be 77 (70 + 10% of 70).