I recently played a game in which my opponant's first two cards played were "Exquisite Blood" (Whenever an opponant loses life, you gain that much life) and "Marauding Blight Priest" (Whenever you gain life, each opponant loses 1 life). As soon as those 2 cards were played (They were the first and only cards played in the game, except for a couple of land cards, btw) the match was over. It's a perpetual motion combo that continues feeding off each other until the other player reaches zero life. After his second card was played (in the 3rd round, I believe) I never got another turn. I just sat there, watching these two cards work off of each other, helpless to stop it, until I was dead. The entire match lasted exactly 3 rounds. Is this really legal??