Since Magic's twentieth anniversary is fast approaching, many players are getting nostalgic and looking to the past, glancing back on what the game has accomplished since 1993 and all the radical changes it's undergone. But there have always been the game-breaking cards, and the almighty strategies made possible by them. In every era of design and gameplay, every color and color combination has had at least a few metagame-warping cards, and just as I did last time for the earliest white cards I'm going to continue looking chronologically at what cards defined each era of Magic for better and worse.
Picking only a handful of cards for the blue section of this time period proved an almost impossible task. There is a reason that for the first few years of Magic's history blue was known as "the most broken color." Things have certainly gotten a lot more balanced since then, but jokes are still made that 80% of the player base would cheer if Island were not reprinted in the next core set. To put this list into perspective: Counterspell didn't even make it on since there were just so many cards so much stronger than it.