Platinum angel effect active before casting it
Just had a Historic Ranked match where I hit an opponent with 50 scute swarms putting him well in the life total negatives but he still stayed alive and started his turn.
Naturally of course I start looking around in graveyards, exiles, cards in play etc to see if I missed him somehow sneaking out a can't lose the game type effect but there's nothing.
So I just keep swinging more attackers again taking him a few hundred further negative, and the very next turn he plays a platinum angel.
I'm assuming something broke and the game was treating the scenario as the card was already in play? Only way I could make sense of it.
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Rezzahan#77802 commented
Did your opponent have at one point The Book of Exalted Deeds out, and activated it? Probaly targeting a land, like Faceless Haven or Mutavault? Then that land is the "problem". There are also Pact Weapon and Cloudsteel Kirin when equipped. Those three are the most commonly overlooked with this kind of issue.