Nyxathid 
Creature — Elemental
$0.35 #15023 0.25 17.6 years
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 similar to Nyxathid 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.
The Rack89%
$0.39↑#167000.3332.5 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Enemy of Enlightenment88%
$0.07↓#25904↓0.36↑6.6 years↓
"This creature gets -1/-1 for each card in your opponents' hands."
Flunk84%
$0.11↓#26475↓0.53↑5.4 years↓
"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."
Pallimud83%
$0.34↓#30464↓0.12↓28.9 years↑
"As this creature enters, choose an opponent."
Black Vise82%
$0.43↑#10830↑0.42↑33.1 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Grim Strider80%
$0.07↓#29381↓0.359.4 years↓
"This creature gets -1/-1 for each card in your hand."
Dread Slag80%
$0.36↑#30949↓0.2720.3 years↑
"This creature gets -4/-4 for each card in your hand."
Lost Order of Jarkeld80%
$0.49↑#29884↓0.2531.3 years↑
"As this creature enters, choose an opponent."
Cursed Rack79%
$0.34↓#22151↓0.76↑32.5 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Skyshroud War Beast78%
$0.38↑#26795↓0.15↓28.2 years↑
"As this creature enters, choose an opponent."
Haunting Apparition78%
$0.14↓#31622↓0.00↓29.9 years↑
"As this creature enters, choose an opponent."
Entropic Specter77%
$0.43↑#27167↓0.81↑28.2 years↑
"As this creature enters, choose an opponent."
+1 more matching line
Bitter Feud77%
$0.50↑#151350.13↓11.8 years↓
"As this enchantment enters, choose two players."
Energy Vortex76%
$0.80↑#28455↓0.13↓29.9 years↑
"As this enchantment enters, choose an opponent."
Stuffy Doll76%
$5.73↑#2248↑0.69↑19.9 years↑
"As this creature enters, choose a player."
Sower of Discord76%
$4.34↑#3566↑0.57↑8.1 years↓
"As this creature enters, choose two players."
True-Name Nemesis75%
$2.49↑#11201↑0.80↑12.8 years↓
"As this creature enters, choose a player."
Skullslither Worm74%
$0.28↓#22414↓0.44↑3.8 years↓
"When this creature enters, each opponent discards a card. For each opponent who can't, put two +1/+1 counters on this creature."
Stingerback Terror73%
$0.26↓#175320.222.4 years↓
"This creature gets -1/-1 for each card in your hand."
Canker Abomination73%
$0.15↓#27211↓0.2518.1 years
"As this creature enters, choose an opponent. This creature enters with a -1/-1 counter on it for each creature that player controls."