Ever since I first learned to play Magic: The Gathering more than ten years ago, I’ve been a big fan of card-based games. Using cards allows games to get away with a relatively simple core ruleset while adding additional rules and exceptions to the established rules as needed on the cards themselves. This means that while a good player will need to have knowledge of all of the cards and their possible effects, a beginner can start with just the core rules and add to his or her knowledge by reading the cards as they’re played. With a large enough library of cards, you get unparalleled dynamism from all the different card interactions, including many even the original designers didn’t predict, and hence a continuously fresh experience.
One of the things that I’ve always admired about Magic is the abundance of what I like to call meta-cards in the game. Most of the cards in Magic represent summonable creatures, castable sorceries, forgeable artifacts and all of the other accouterments that one would expect in a game depicting a duel between powerful mages, but the meta-cards are none of these. Instead, these cards have effects that manipulate the deck itself, allowing the user to among other things, draw additional cards, retrieve cards that have been discarded, and even go looking into their library for specific cards to put into their hand.