Exquisite Blood and Marauding Blight Priest infinitely trigger each other
I've noticed in games lately that Exquisite Blood and Marauding Blight Priest have a very unique interaction where one causes you to gain life whenever you do damage, and one causes you to do damage whenever you gain life, causing one to trigger the other over and over infinitely until the other player loses the game. This means that having a 4 cost and a 5 cost black card, as well as ANY card that causes you to gain life OR deal damage, means you immediately win the game with no possibility of a counter, and can go from 20 life to 0 life on turn 5 or 6.
I'm not sure this interaction was intended to work this way, which is why I'm saying anything. It seems a little exploit-y.

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Raistlin#67986 commented
Wow a whole year and it's still broken... that's cool
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Jotta#58730 commented
This just happened to me and I was like how can this be allowed
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Raven0311#19455 commented
Exquisite blood should be banned, once the loop starts there is nothing you can do. All they need is 2 cards,
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Celebion#43075 commented
Not a bug, but yeah it's known and I can see how that's annoying. Try running amulet of safekeeping, whirlwind denial, angel of grace, or anything to counter or destroy the initial pieces before it can be activated, or destroy a piece in response to the loop starting. Hope this helps, and apologies if it's unwarranted.