Canker Abomination {2}{B/G}{B/G}
Creature — Treefolk Horror
As this creature enters, choose an opponent. This creature enters with a -1/-1 counter on it for each creature that player controls.
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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.