Tendrils of Corruption 
Instant
$0.11 #9074 0.04 19.9 years
Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
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Cards similar to Tendrils of Corruption 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.
Consuming Corruption96%
$0.34↑#2422↑0.18↑2.2 years↓
"this card deals X damage to target creature or planeswalker and you gain X life, where X is the number of Swamps you control."
Swallowing Plague88%
$0.12↑#19341↓0.27↑21.9 years↑
"this card deals X damage to target creature and you gain X life."
Essence Extraction88%
$0.07↓#21913↓0.009.9 years↓
"this card deals 3 damage to target creature and you gain 3 life."
Sorin's Thirst88%
$0.13↑#18111↓0.31↑15.1 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Pharika's Cure88%
$0.07↓#22608↓0.20↑12.9 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Last Kiss88%
$0.08↓#26905↓0.17↑16.4 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Vicious Hunger88%
$0.13↑#28001↓0.0026.6 years↑
"this card deals 2 damage to target creature and you gain 2 life."
Douse in Gloom87%
$0.05↓#25524↓0.27↑20.6 years
"this card deals 2 damage to target creature and you gain 2 life."
Winter's Intervention87%
$0.10↓#16590↓0.17↑1.9 years↓
"this card deals 2 damage to target creature. You gain 2 life."
Corrupt86%
$0.10↓#98920.0027.9 years↑
"this card deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way."
Cat-Gator85%
$0.13↑#18686↓0.000.8 years↓
"When this creature enters, it deals damage equal to the number of Swamps you control to any target."
Soul Shred83%
$0.12↑#31844↓0.0029.3 years↑
"this card deals 3 damage to target nonblack creature. You gain 3 life."
Defibrillating Current81%
$0.09↓#20793↓0.15↑1.4 years↓
"this card deals 4 damage to target creature or planeswalker and you gain 2 life."
March of Wretched Sorrow78%
$0.36↑#93190.39↑4.5 years↓
"this card deals X damage to target creature or planeswalker and you gain X life."
Last Stand78%
$0.36↑#18830↓0.31↑25.3 years↑
"Target opponent loses 2 life for each Swamp you control. this card deals damage to target creature equal to the number of Mountains you control. Create a 1/1 green Saproling creature token for each Forest you control. You gain 2 life for each Plains you control. Draw a card for each Island you control, then discard that many cards."
Feast of Flesh77%
$0.16↑#31046↓0.0020.1 years
"this card deals X damage to target creature and you gain X life, where X is 1 plus the number of cards named this card in all graveyards."
Defile76%
$1.56↑#987↑0.26↑7.2 years↓
"Target creature gets -1/-1 until end of turn for each Swamp you control."
Deadly Riposte76%
$0.14↑#19371↓0.003.8 years↓
"this card deals 3 damage to target tapped creature and you gain 2 life."
Lantern Flare76%
$0.17↑#20541↓0.19↑4.8 years↓
"this card deals X damage to target creature or planeswalker and you gain X life. [X is the number of creatures you control.]"
Warleader's Helix73%
$0.15↑#14705↓0.0013.3 years↓
"this card deals 4 damage to any target and you gain 4 life."