Bloodletter Quill 
Artifact
{2}, {T}, Put a blood counter on this artifact: Draw a card, then you lose 1 life for each blood counter on this artifact.
{U}{B}: Remove a blood counter from this artifact.
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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.