Living Card Games
“LCG" or Living Card Game—is a term trademarked by Fantasy Flight Games that describes a card game that is defined by a certain type of production. The publisher makes a core set of cards, often including multiple copies of each in the same box, and then adds to that pool of cards with expansions.
The key difference between an LCG and a CCG (collectible card game) is that the packaging for an LCG is not randomized. Once you buy into the game, you have access to all of the cards, and you can build your deck as you wish to compete against—or alongside—fellow players.