Nyxathid 


Creature — Elemental
As this creature enters, choose an opponent.
This creature gets -1/-1 for each card in the chosen player's 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.
Enemy of Enlightenment 92%
$0.08#25476
"This creature gets -1/-1 for each card in your opponents' hands."
Sandstone Oracle 97%
$0.24#4233
"When this creature enters, choose an opponent. If that player has more cards in hand than you, draw cards equal to the difference."