Escaped Experiment {1}{U}
Artifact Creature — Phyrexian Beast
Whenever this creature attacks, target creature an opponent controls gets -X/-0 until end of turn, where X is the number of artifacts you control.
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Cards that do something similar 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.
Briarblade Adept 97%
$0.16#21885
"Whenever this creature attacks, target creature an opponent controls gets -1/-1 until end of turn."
Vedalken Mesmerist 92%
$0.02#29049
"Whenever this creature attacks, target creature an opponent controls gets -2/-0 until end of turn."
Binding Geist // Spectral Binding 92%
$0.06#25506
"Whenever this creature attacks, target creature an opponent controls gets -2/-0 until end of turn."
Spring Splasher 89%
$0.18#17734
"Whenever this creature attacks, target creature defending player controls gets -3/-0 until end of turn."