Raven of Fell Omens 
Creature — Bird
$0.14 #11683 0.29 2.5 years
Flying
Whenever you commit a crime, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)
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Cards similar to Raven of Fell Omens 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.
Drana's Emissary92%
$0.34↑#6763↑0.06↓11.0 years↑
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Dogged Pursuit92%
$0.17↑#129220.335.7 years↑
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Agent of Masks88%
$0.14#17946↓0.2220.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Subversion88%
$1.92↑#17068↓0.00↓27.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Vampire Neonate88%
$0.13↓#15588↓0.06↓8.3 years↑
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Sanguine Syphoner88%
$0.22↑#6477↑0.00↓1.9 years
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Sneering Shadewriter88%
$0.12↓#20550↓0.08↓0.5 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Skirmish Rhino87%
$0.24↑#17215↓0.06↓1.5 years
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Blight Keeper87%
$0.25↑#17066↓0.00↓9.1 years↑
"Flying"
Blood Hustler86%
$0.17↑#131780.282.5 years
"
: Target opponent loses 1 life and you gain 1 life."
: Target opponent loses 1 life and you gain 1 life."
Sinister Monolith84%
$0.27↑#6542↑0.07↓2.2 years
"At the beginning of combat on your turn, each opponent loses 1 life and you gain 1 life."
Insatiable Hemophage84%
$0.22↑#9202↑0.15↓6.5 years↑
"Whenever this creature mutates, each opponent loses X life and you gain X life, where X is the number of times this creature has mutated."
Vampire Opportunist84%
$0.18↑#25574↓0.00↓7.5 years↑
"
: Each opponent loses 2 life and you gain 2 life."
: Each opponent loses 2 life and you gain 2 life."
Melancholic Poet84%
$0.16↑#14936↓0.18↓0.5 years↓
"Whenever you cast an instant or sorcery spell that targets a creature, each opponent loses 1 life and you gain 1 life."
Garrulous Sycophant82%
$0.30↑#17032↓0.40↑10.1 years↑
"At the beginning of your end step, if you're the monarch, each opponent loses 1 life and you gain 1 life."
Night Market Lookout82%
$0.17↑#131460.00↓10.1 years↑
"Whenever this creature becomes tapped, each opponent loses 1 life and you gain 1 life."
Intimidation Campaign82%
$0.11↓#15935↓0.00↓2.5 years
"When this enchantment enters, each opponent loses 1 life, you gain 1 life, and you draw a card."
Chancellor of the Dross82%
$1.33↑#17381↓0.61↑15.4 years↑
"You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, each opponent loses 3 life, then you gain life equal to the life lost this way."
Scheming Aspirant82%
$0.28↑#6932↑0.333.7 years↑
"Whenever you proliferate, each opponent loses 2 life and you gain 2 life."
Tormented Hero82%
$0.16↑#23059↓0.2413.1 years↑
"Whenever you cast a spell that targets this creature, each opponent loses 1 life. You gain life equal to the life lost this way."