Soul Enervation 
Enchantment
$0.14 #10971 0.12 2.6 years
Flash
When this enchantment enters, target creature gets -4/-4 until end of turn.
Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life.
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Cards similar to Soul Enervation 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.
Undead Hand Ninja98%
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"Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life."
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$0.12↓#20338↓0.00↓2.4 years
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
+1 more matching line
Dogged Pursuit86%
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"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Drana's Emissary84%
$0.35↑#6604↑0.22↑10.9 years↑
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Farbog Boneflinger82%
$0.06↓#30716↓0.29↑14.6 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Blister Beetle82%
$0.05↓#24629↓0.29↑17.9 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Dissection Practice82%
$0.24↑#17343↓0.00↓0.4 years↓
"Up to one target creature gets -1/-1 until end of turn."
+1 more matching line
Eyeblight Assassin82%
$0.07↓#21888↓0.31↑11.1 years↑
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Vampire Neonate82%
$0.13↓#15398↓0.00↓8.1 years↑
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Keening Banshee81%
$0.12↓#27308↓0.00↓21.0 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Fourth Bridge Prowler81%
$0.21↑#14512↓0.00↓9.6 years↑
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Subversion81%
$2.15↑#16719↓0.00↓27.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Agent of Masks81%
$0.12↓#17800↓0.0720.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Stab80%
$0.17↑#108870.181.8 years
"Target creature gets -2/-2 until end of turn."
Disfigure80%
$0.05↓#16184↓0.2116.9 years↑
"Target creature gets -2/-2 until end of turn."
Dubious Delicacy80%
$0.25↑#16506↓0.021.1 years↓
"When this artifact enters, up to one target creature gets -3/-3 until end of turn."
Skulking Killer80%
$0.10↓#25265↓0.00↓4.8 years↑
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."
Ark of Hunger79%
$0.31↑#91060.00↓0.4 years↓
"Whenever one or more cards leave your graveyard, this artifact deals 1 damage to each opponent and you gain 1 life."
Skirmish Rhino79%
$0.23↑#17043↓0.161.4 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Vampire Opportunist78%
$0.17↑#25216↓0.067.3 years↑
"
: Each opponent loses 2 life and you gain 2 life."
: Each opponent loses 2 life and you gain 2 life."