Furtive Courier {2}{U}
Creature — Merfolk Advisor
This creature can't be blocked as long as you've sacrificed an artifact this turn.
Whenever this creature attacks, draw a card, then discard a card.
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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.
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