Dark Withering 


Instant
Destroy target nonblack creature.
Madness {B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
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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.
Sever Soul 98%
$0.12#26704
"Destroy target nonblack creature. It can't be regenerated. You gain life equal to its toughness."
Violet Pall 98%
$0.21#21481
"Destroy target nonblack creature. Create a 1/1 black Faerie Rogue creature token with flying."
Murderous Spoils 98%
$0.07#26724
"Destroy target nonblack creature. It can't be regenerated. You gain control of all Equipment that were attached to it."
Vendetta 97%
$0.20#11184
"Destroy target nonblack creature. It can't be regenerated. You lose life equal to that creature's toughness."
Death Mutation 96%
$0.34#19669
"Destroy target nonblack creature. It can't be regenerated. Create X 1/1 green Saproling creature tokens, where X is that creature's mana value."