The world of Ophidian 2350 is centralized around gladiatorial combat. But, don't start looking for Russell Crowe, these gladiators are aliens, bio-enhanced humans, mystics, and all sorts of otherworldly beings. Theme aside, this new CCG from Fleer, released at Gen Con 2003, has some unusual new mechanics that separate it from the pack. First, Players use 'credits' to summon their units, equipment, and minions (support characters), much like Legends of the Five Rings. What is unique about Ophidian is a mechanic called 'The Flow'. Each card has a 'charge + or -' on it. Play a positive charged card, and you can keep playing cards. Play a negative and your turn ends and your opponent can start playing their cards. Basically, it helps provide a little 'momentum' incentive, and adds strategy. - BoardGameGeek