Poison the Waters 

Sorcery
Choose one —
• All creatures get -1/-1 until end of turn.
• Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.
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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.
Splitting Headache 100%
$0.11#30859
"• Target player reveals their hand. You choose a card from it. That player discards that card."
+1 more matching line
Deluge of Doom 83%
$0.26#10019
"All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard."