Sandman's Quicksand {1}{B}{B}
Sorcery
Mayhem {3}{B} (You may cast this card from your graveyard for {3}{B} if you discarded it this turn. Timing rules still apply.)
All creatures get -2/-2 until end of turn. If this spell's mayhem cost was paid, creatures your opponents control get -2/-2 until end of turn instead.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Golden Demise 100%
$0.25#17569
"All creatures get -2/-2 until end of turn. If you have the city's blessing, instead only creatures your opponents control get -2/-2 until end of turn."
Glistening Deluge 96%
$0.26#20465
"All creatures get -1/-1 until end of turn. Creatures that are green and/or white get an additional -2/-2 until end of turn."
Feast of Succession 95%
$0.26#14588
"All creatures get -4/-4 until end of turn. You become the monarch."