Scar {B/R}
Instant
Put a -1/-1 counter on target creature.
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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.
Blur of Blades 98%
$0.06#21920
"Put a -1/-1 counter on target creature. this card deals 2 damage to that creature's controller."
Virulent Wound 86%
$0.20#13827
"Put a -1/-1 counter on target creature. When that creature dies this turn, its controller gets a poison counter."