Metalspinner's Puzzleknot {2}
Artifact
When this artifact enters, you draw a card and you lose 1 life.
{2}{B}, Sacrifice this artifact: You draw a card and you lose 1 life.
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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.
Infernal Idol 87%
$0.18#16494
"{1}{B}{B}, {T}, Sacrifice this artifact: You draw two cards and you lose 2 life."
Mephitic Draught 83%
$0.23#8156
"When this artifact enters or is put into a graveyard from the battlefield, you draw a card and you lose 1 life."
First-Sphere Gargantua 82%
$0.12#19841
"When this creature enters, you draw a card and you lose 1 life."
Merciless Harlequin 82%
$0.16#11718
"When this creature enters, you draw a card and you lose 1 life."