Normally at least five cards. Extra cards can be bought for anywhere from ten to fifty bucks apiece depending on the event. It is not unusual for a winning hand to have "four of a kind".... I've seen people spend a lot of money for extra cards, sometimes as many as 20. I personally think it is a good idea to limit the number of extra cards that can be bought to keep it more fair, so that someone is not "buying" their prize.