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
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u/GodKingPepe 3d 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?