bloodthirsty conqueror & Enduring Tenacity infinite combo
As the title says. It seems that Bloodthirsty Conqueror heals the controller for the damage it does to an opponent. Enduring Tenacity damages your opponent for the amount you heal. And there it goes on... and on.... and on... until they're dead, of course. So not infinite in that regard... still. It appears that Bloodthirsty Conqueror is a trouble card.

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PressureChamber#23947 commented
I don't think Wizards of the Coast care about how badly it's been screwing up the game. I guess the solution would be to stop spending money on anything they make until they either realize they screwed up or go out of business.
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Bishop#67532 commented
It's not only the enduring tenacity combo, there's a couple other combos like the blight priest among others.
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korben44#75523 commented
I had this happen to me with Bloodthirsty Conqueror and Marauding Blight - Priest.
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BahaMaven#42049 commented
I experienced this today, with the exact same card combo. This should be fixed.