Strange bug
I had Ureni and was about to win the game. My opponent attacked me with a 6/6 flying Demon and also had a Bat that doubled the damage they could deal to me. However, I blocked the Demon with Ureni, which had protection from black, so I took no damage and the Demon died. But something strange happened at that exact moment: I automatically lost the game, even though the Demon died and dealt no damage to me. I don't understand what happened.
Xifis#70422
shared this idea
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Rezzahan#77802
commented
Your opponent had Unholy Annex unlocked and still controlled a Demon when their end step began. The trigger from the Annex made you lose 2 life and them gain 2 life, except due to the Bloodletter of Aclazotz (their Demon) your life loss was doubled, making you lose your 4 remaining life points, and the game.