Nyxathid 
Creature — Elemental
$0.34 #15194 0.00 17.7 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%
$0.44↑#168790.79↑32.6 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Enemy of Enlightenment88%
$0.06↓#26217↓0.55↑6.7 years↓
"This creature gets -1/-1 for each card in your opponents' hands."
Flunk84%
$0.11↓#26820↓0.005.5 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%
$0.42↑#30810↓0.36↑29.0 years↑
"As this creature enters, choose an opponent."
Black Vise82%
$0.47↑#11006↑0.31↑33.2 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Grim Strider80%
$0.10↓#29788↓0.009.5 years↓
"This creature gets -1/-1 for each card in your hand."
Dread Slag80%
$0.36↑#31328↓0.24↑20.5 years↑
"This creature gets -4/-4 for each card in your hand."
Lost Order of Jarkeld80%
$0.49↑#30145↓0.0031.4 years↑
"As this creature enters, choose an opponent."
Skyshroud War Beast79%
$0.49↑#27104↓0.0628.3 years↑
"As this creature enters, choose an opponent."
Cursed Rack79%
$0.35↑#22387↓1.00↑32.6 years↑
"As this artifact enters, choose an opponent."
+1 more matching line
Haunting Apparition78%
$0.15↓#31985↓0.12↑30.0 years↑
"As this creature enters, choose an opponent."
Entropic Specter77%
$0.46↑#26832↓0.50↑28.3 years↑
"As this creature enters, choose an opponent."
+1 more matching line
Energy Vortex77%
$0.82↑#28836↓0.53↑30.0 years↑
"As this enchantment enters, choose an opponent."
Bitter Feud77%
$0.56↑#154540.14↑12.0 years↓
"As this enchantment enters, choose two players."
Stuffy Doll76%
$6.00↑#2257↑0.62↑20.0 years↑
"As this creature enters, choose a player."
Sower of Discord76%
$4.30↑#3630↑0.64↑8.2 years↓
"As this creature enters, choose two players."
True-Name Nemesis75%
$2.58↑#11487↑0.87↑13.0 years↓
"As this creature enters, choose a player."
Skullslither Worm74%
$0.27↓#22794↓0.32↑3.9 years↓
"When this creature enters, each opponent discards a card. For each opponent who can't, put two +1/+1 counters on this creature."
Sewer Nemesis73%
$1.00↑#6122↑0.25↑15.3 years↓
"As this creature enters, choose a player."
Canker Abomination73%
$0.16↓#27548↓0.0018.2 years
"As this creature enters, choose an opponent. This creature enters with a -1/-1 counter on it for each creature that player controls."