If 'Eureka!' is in play, it is sent to the card owner's Boot Hill. Eureka enters play attached to the gang on your left. Whenever Eureka attaches to a Player's gang, he must discard one card from his or her hand. A Player's hand size is reduced by one while Eureka is attached. Eureka leaves that Player when he or she wins a shootout and attaches to the next player on the left. Only one Eureka can be in play at a time.