Cruel Sadist {B}
Creature — Human Assassin
{B}, {T}, Pay 1 life: Put a +1/+1 counter on this creature.
{2}{B}, {T}, Remove X +1/+1 counters from this creature: It deals X damage to target 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.
Sewer Rats 84%
$0.15#21732
"{B}, Pay 1 life: This creature gets +1/+0 until end of turn. Activate no more than three times each turn."