Serrated Biskelion {3}
Artifact Creature — Construct
{T}: Put a -1/-1 counter on this creature and 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.