Being the first trading card game, Magic: The Gathering has a lot of Game Breakers. Part of this stems from the fact that the original editions of the game were little better than an Obvious Beta (so much so that the second release of the Limited First Edition was named "Limited Edition Beta" (With the first being "Limited Edition Alpha")); indeed, like most games that are played extensively, the lion's share of Game Breakers are discovered by players post-release. But the fact that Wizards of the Coast keep trying new things can't help. (Well, it does make the game more fun; we're just talking about the inevitable impact on game balance.)