Fumulus, the Infestation {3}{B}
Legendary Creature — Vampire Insect
Flying, deathtouch
Whenever a player sacrifices a nontoken creature, create a 1/1 black Insect creature token with flying.
Whenever an Insect, Leech, Slug, or Worm you control attacks, defending player loses 1 life and you gain 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.
Revenge of Ravens 90%
$0.48#2802
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life and you gain 1 life."
Brutal Hordechief 88%
$2.67#6618
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Campaign of Vengeance 88%
$0.40#12164
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Hooded Blightfang 88%
$0.80#6647
"Whenever a creature you control with deathtouch attacks, each opponent loses 1 life and you gain 1 life."
Reaper's Talisman 87%
$0.12#13011
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Ragged Recluse // Odious Witch 87%
$0.17#25285
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Agate-Blade Assassin 87%
$0.18#8468
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Valley Rotcaller 86%
$3.33#2294
"Whenever this creature attacks, each opponent loses X life and you gain X life, where X is the number of other Squirrels, Bats, Lizards, and Rats you control."
Sanguine Syphoner 86%
$0.21#6608
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Postmortem Professor 86%
$0.24#17114
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Bontu's Monument 85%
$8.37#664
"Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life."
MacCready, Lamplight Mayor 84%
$6.58#3650
"Whenever a creature with power 4 or greater attacks you, its controller loses 2 life and you gain 2 life."
Gloom Sower 82%
$0.21#20542
"Whenever this creature becomes blocked by a creature, that creature's controller loses 2 life and you gain 2 life."
Dai Li Agents 82%
$0.18#14213
"Whenever this creature attacks, each opponent loses X life and you gain X life, where X is the number of creatures you control with +1/+1 counters on them."
Hostile Hostel // Creeping Inn 81%
$0.65#10239
"Whenever this creature attacks, you may exile a creature card from your graveyard. If you do, each opponent loses X life and you gain X life, where X is the number of creature cards exiled with this creature."
Psychomancer 81%
$1.06#8776
"Whenever this creature or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, target opponent loses 1 life and you gain 1 life."
Night Market Lookout 81%
$0.25#12716
"Whenever this creature becomes tapped, each opponent loses 1 life and you gain 1 life."
Soul Enervation 80%
$0.31#10741
"Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life."
Undead Hand Ninja 80%
$1.41#23767
"Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life."