Magic the Gathering!
Okay, so for those of you who don't know, Magic is a card game. Each player assembles a deck that is composed of land, creatures, and spells. Land is used as a mana source to fuel your spells, and can be used each turn. There are 5 basic types of land: Plains (white mana), Mountains (red mana), Forests (green mana), Swamps (black mana), and Islands (blue mana).
In the upper right hand corner of a card is the mana cost. A number over a gray circle indicates that many mana of any color. All other mana costs appear as a colored symbol. You may (generally) have a limit of 4 of any one specific card in your deck, with the exception of basic land. So if you have 4 Shivan Dragons, you are not allowed to have any more, but you can put other types of dragons in. Depending on the type of game being played, there is a lower limit of 60 cards in a player's deck... which means that even if you pour tons of money into building the ultimate deck, there's always a chance that you'll just be dealt a bad hand.
Basic game play goes as follows:
Each player begins with 20 life points. The object is to be the last player with life points after all other players have been eliminated. A player may be eliminated by reducing their life total to 0, by attempting to draw from their deck when it contains no cards, or by receiving 10 or more poison counters.
Each player has a starting hand of 7 cards. Each player takes a turn in a pre-determined order. A turn is separated into the following phases: