Cost is the required amount needed to play the Attribute of cards.
Cost includes attribute cost that needs to be paid with a specific will attribute and free cost that can be paid with any will attribute.
Attribute cost is defined by the amount of will symbols on the left side of the cost. You need one specific will for each will symbol shown here.
Free cost is defined by the number on the right side of the cost. You have to pay an amount of any will attribute equal to the number printed here.
Total cost is the attribute cost plus the free cost.
A card with attribute cost has an attribution specified for each symbol on it.