Ravenloft Adventurer {3}{B}
Creature — Human Rogue Assassin
When this creature enters, you take the initiative.
If a creature an opponent controls would die, instead exile it and put a hit counter on it.
Whenever this creature attacks, if you've completed a dungeon, defending player loses 1 life for each card they own in exile with a hit counter on it.
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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.
Delta Bloodflies 96%
$0.19#16152
"Whenever this creature attacks, if you control a creature with a counter on it, each opponent loses 1 life."
Thornbow Archer 94%
$0.08#14509
"Whenever this creature attacks, each opponent who doesn't control an Elf loses 1 life."
Guiltfeeder 93%
$1.44#6718
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Keeper of Tresserhorn 90%
$0.64#31165
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Lim-Dûl's Paladin 89%
$0.26#28541
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Blood Reckoning 89%
$0.21#12059
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Marchesa's Decree 89%
$3.64#7127
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Calculating Lich 89%
$0.73#12897
"Whenever a creature attacks one of your opponents, that player loses 1 life."
Cryptolith Fragment // Aurora of Emrakul 87%
$0.27#4720
"Whenever this creature attacks, each opponent loses 3 life."
Spiteful Returned 85%
$0.23#21719
"Whenever this creature or enchanted creature attacks, defending player loses 2 life."
Ravenous Slime 83%
$1.89#11259
"If a creature an opponent controls would die, instead exile it and put a number of +1/+1 counters equal to that creature's power on this creature."
Caustic Bronco 83%
$0.38#6492
"Whenever this creature attacks, reveal the top card of your library and put it into your hand. You lose life equal to that card's mana value if this creature isn't saddled. Otherwise, each opponent loses that much life."