Nebelgast Intruder 

Creature — Spirit
$0.03 #29209 0.00 4.9 years
Flash
Flying
When this creature enters, up to one target creature an opponent controls gets -2/-0 until end of turn.
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Cards similar to Nebelgast Intruder 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.
Faerie Duelist100%
$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
Burrog Befuddler99%
$0.16↑#16436↑0.22↑5.4 years
"When this creature enters, target creature an opponent controls gets -1/-0 until end of turn."
+1 more matching line
Cogwork Wrestler99%
$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 Elder99%
$0.10↑#22086↑0.051.4 years↓
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Brinebarrow Intruder99%
$0.16↑#238200.50↑5.6 years
"When this creature enters, target creature an opponent controls gets -2/-0 until end of turn."
Threnody Singer92%
$0.14↑#260740.53↑6.6 years↑
"When this creature enters, target creature an opponent controls gets -X/-0 until end of turn, where X is your devotion to blue."
Fleeting Distraction90%
$0.07↑#9052↑0.21↑16.4 years↑
"Target creature gets -1/-0 until end of turn."