Quirion Dryad {1}{G}
Creature — Dryad
Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this 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.