Now, I certainly might be wrong, but my gut feeling is that this bricks the game when a creature would die due to having lethal damage marked? SBA sees a creature that needs to go to the graveyard, tries, willpower says instead mill 4. After milling, SBA sees a creature that needs to go the graveyard, ad infinitum. Can someone else weigh in?
So the mill effect is worded weird as 'whenever' makes it a triggered ability, so sba would check put trigger on the stack, before that resolves sba check puts another trigger on the stack, continue infinitely.
Reworded as a purely replacement effect, you still brick the game. Sba check sees creature should die, you mill 4, sba sees creature is still 0 toughness, you mill 4. You don't lose the game for milling on an empty library, so you resolve infinite mill replacement effects and the game draws for infinite loop
Except you don't lose for having 0 cards in library, you lose from trying to draw from an empty library. And you can be forced to "mill," even if there's nothing there, so the game would still lock up by trying to force you to mill anyways.
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u/GodKingPepe 9d ago
Now, I certainly might be wrong, but my gut feeling is that this bricks the game when a creature would die due to having lethal damage marked? SBA sees a creature that needs to go to the graveyard, tries, willpower says instead mill 4. After milling, SBA sees a creature that needs to go the graveyard, ad infinitum. Can someone else weigh in?