Shadows of the Past {1}{B}
Enchantment
Whenever a creature dies, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{4}{B}: Each opponent loses 2 life and you gain 2 life. Activate only if there are four or more creature cards in your graveyard.
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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.
Kami of Jealous Thirst 99%
$0.15#19310
"{4}{B}: Each opponent loses 2 life and you gain 2 life. This ability costs {4}{B} less to activate if you've drawn three or more cards this turn. Activate only once each turn."
Restless Bloodseeker // Bloodsoaked Reveler 98%
$0.19#11058
"{4}{B}: Each opponent loses 2 life and you gain 2 life."
Desiccated Naga 84%
$0.09#27853
"{3}{B}: Target opponent loses 2 life and you gain 2 life. Activate only if you control a Liliana planeswalker."