Nivix Barrier 

Creature — Illusion Wall
$0.07 #25921 0.22 11.1 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.
Cogwork Wrestler90%
$0.16↑#19607↑0.11↓2.8 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Humbling Elder90%
$0.10↑#220860.05↓1.4 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Brinebarrow Intruder90%
$0.16↑#238200.50↑5.6 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Burrog Befuddler90%
$0.16↑#16436↑0.225.4 years↓
"When this creature enters, target creature an opponent controls gets -1/-0 until end of turn."
+1 more matching line
Faerie Duelist90%
$0.09↑#19629↑0.39↑7.6 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
+1 more matching line
Nebelgast Intruder90%
$0.03↓#292090.00↓4.9 years↓
"When this creature enters, up to one target creature an opponent controls gets -2/-0 until end of turn."
Sword Dancer88%
$0.13↑#298700.2726.3 years↑
"
: Target attacking creature gets -1/-0 until end of turn."