In short, as many as your cards allow you to
Fauna Shaman Survival of the Fittest is a messed up card, and Fauna Shaman gives you much of the same flexibility
Once you have enough Treasures, you can dump all that mana into a Hellkite Charger, and you have yourself an infinite combat loop
Besides that, this Carefree Surfer has a willpower of eight, which means that there aren't many cards that can take him out in a one-on-one challenge
You "discover" when you finish the process of revealing cards, exiling an appropriate nonland card, casting that card or putting it into your hand, and putting the remaining exiled cards on the bottom of your library in a random order, even if one or more of those actions were impossible for some reason