Watchdog 
Artifact Creature — Dog
$0.22 #25911 0.15 28.9 years
This creature blocks each combat if able.
As long as this creature is untapped, all creatures attacking you get -1/-0.
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Cards similar to Watchdog 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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"Whenever a creature attacks you, it gets -1/-0 until end of turn."
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"Whenever one or more creatures attack you, those creatures get -1/-0 until end of turn."
Turn the Tide78%
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Hysterical Blindness78%
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"Creatures your opponents control get -4/-0 until end of turn."
Reveille Squad78%
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"Whenever one or more creatures attack you, if this creature is untapped, you may untap all creatures you control."
Uncomfortable Chill74%
$0.04↓#248560.00↓8.1 years↓
"Creatures your opponents control get -2/-0 until end of turn."
Blinding Spray74%
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"Creatures your opponents control get -4/-0 until end of turn."
Hampering Snare74%
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"Creatures your opponents control get -2/-0 until end of turn."