Artifacts win the game so this would only be considered if you really needed the extra cash. During their turn as an option, players may sell an aquired artifact tile to the Bank for 2 gold coins. This tile is discarded to the box and out of the game. Players must be at the start Cross like normal when performing Trades but this may be done before and in addition to a normal game trade action.
i.e. A player sells an artifact and now has gold to discard/draw 2 fresh artifacts like the normal Trade rules allow.
This option is good to have if none of the cities you uncover have gold in them.
Not a huge change to the game but it's nice to have the option. Feel free to submit comments.