Burrog Befuddler 

Creature — Frog Wizard
$0.15 #16834 0.00 5.5 years
Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, target creature an opponent controls gets -1/-0 until end of turn.
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Cards similar to Burrog Befuddler 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.
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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, up to one target creature an opponent controls gets -2/-0 until end of turn."
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$0.13↓#26382↓0.096.7 years↑
"When this creature enters, target creature an opponent controls gets -X/-0 until end of turn, where X is your devotion to blue."
+1 more matching line
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"Target creature gets -1/-0 until end of turn."