1 - Determine which type of base enhancement to add and start with that base cost in gold.
Double the base cost of an enhancement (other than an attack hex) if it is applied to an ability that targets multiple figures.
2 - Determine which ability card the enhancement will be added to and add the appropriate amount of gold to the total based on the level of the card.
3 - If there is any previous enhancements on the same action then add the appropriate amount of gold.
The total cost o the enhancement has now been calculated. This is how much a player must pay in order to have that enhancement.