Nivix Barrier 

Creature — Illusion Wall
$0.05 #26103 0.12 11.3 years
Flash (You may cast this spell any time you could cast an instant.)
Defender (This creature can't attack.)
When this creature enters, target attacking creature gets -4/-0 until end of turn.
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Cards similar to Nivix Barrier 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.
Humbling Elder90%
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"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
+1 more matching line
Brinebarrow Intruder90%
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"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
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"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
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$0.15↑#16834↑0.00↓5.5 years↓
"When this creature enters, target creature an opponent controls gets -1/-0 until end of turn."
Faerie Duelist90%
$0.09↑#19834↑0.28↑7.7 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Nebelgast Intruder89%
$0.06↑#295320.27↑5.1 years↓
"When this creature enters, up to one target creature an opponent controls gets -2/-0 until end of turn."
Sword Dancer88%
$0.11↑#302590.1126.4 years↑
"
: Target attacking creature gets -1/-0 until end of turn."