These are collectible trading card game
s organized as follows.
Each player pays an entry fee which covers several booster packs and an additional fee for the store. Then each player gets a booster pack. The players are seated in a circle, and each player chooses one card and then passes the pack to the player on one side of them. When the pack has circulated and no cards are left, a second package is given to each player, and after that a third. After that players may be given additional cards to fill out their deck, land in Magic the Gathering. The players then choose a subset of the cards they have selected to make a deck.
After everyone is playing with a full deck, physically at least the tournament is run pretty much like any other tournament. In addition to any prize, the players take home the cards they have 'drafted'.