Nightmarish End {2}{B}
Instant
Target creature gets -X/-X until end of turn, where X is the number of cards in your hand.
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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.
Flunk 95%
$0.11#26085
"Target creature gets -X/-X until end of turn, where X is 7 minus the number of cards in that creature's controller's hand."
Festive Funeral 93%
$0.15#25339
"Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard."
Necrotic Wound 83%
$0.12#17941
"Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead."
Faerie Fencing 82%
$0.26#7966
"Target creature gets -X/-X until end of turn. That creature gets an additional -3/-3 until end of turn if you controlled a Faerie as you cast this spell."
Induce Despair 82%
$0.10#27835
"Target creature gets -X/-X until end of turn, where X is the revealed card's mana value."
Olivia's Midnight Ambush 82%
$0.11#26450
"Target creature gets -2/-2 until end of turn. If it's night, that creature gets -13/-13 until end of turn instead."
Desert's Due 82%
$0.14#23474
"Target creature gets -2/-2 until end of turn. It gets an additional -1/-1 until end of turn for each Desert you control."
Lethal Exploit 81%
$0.18#21277
"Target creature gets -2/-2 until end of turn. It gets an additional -1/-1 until end of turn for each modified creature you controlled as you cast this spell."