Thornbow Archer 
Creature — Elf Archer
Whenever this creature attacks, each opponent who doesn't control an Elf loses 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.
Delta Bloodflies 94%
$0.19#16152
"Whenever this creature attacks, if you control a creature with a counter on it, each opponent loses 1 life."
Ravenloft Adventurer 94%
$0.36#5509
"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."
Guiltfeeder 90%
$1.44#6718
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Calculating Lich 88%
$0.73#12897
"Whenever a creature attacks one of your opponents, that player loses 1 life."
Keeper of Tresserhorn 87%
$0.64#31165
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Cryptolith Fragment // Aurora of Emrakul 87%
$0.27#4720
"Whenever this creature attacks, each opponent loses 3 life."
Lim-Dûl's Paladin 87%
$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 87%
$0.21#12059
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Marchesa's Decree 87%
$3.64#7127
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Spiteful Returned 85%
$0.23#21719
"Whenever this creature or enchanted creature attacks, defending player loses 2 life."
Caustic Bronco 80%
$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."