Tendrils of Corruption 
Instant
$0.15 #9025 0.18 20.0 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%
$0.21↑#2411↑0.122.3 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."
Corrupt88%
$0.11↓#100630.33↑28.0 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-Gator86%
$0.12↓#18535↓0.110.9 years↓
"When this creature enters, it deals damage equal to the number of Swamps you control to any target."
Swallowing Plague86%
$0.11↓#19688↓0.07↓22.1 years↑
"this card deals X damage to target creature and you gain X life."
Essence Extraction86%
$0.05↓#22136↓0.00↓10.1 years↓
"this card deals 3 damage to target creature and you gain 3 life."
Vicious Hunger86%
$0.12↓#28419↓0.00↓26.7 years↑
"this card deals 2 damage to target creature and you gain 2 life."
Last Kiss86%
$0.08↓#27097↓0.07↓16.5 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Douse in Gloom86%
$0.05↓#25853↓0.05↓20.7 years
"this card deals 2 damage to target creature and you gain 2 life."
Pharika's Cure86%
$0.04↓#22921↓0.00↓13.1 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Sorin's Thirst86%
$0.09↓#18351↓0.07↓15.3 years↓
"this card deals 2 damage to target creature and you gain 2 life."
Winter's Intervention85%
$0.10↓#16931↓0.06↓2.1 years↓
"this card deals 2 damage to target creature. You gain 2 life."
Soul Shred81%
$0.10↓#32147↓0.05↓29.5 years↑
"this card deals 3 damage to target nonblack creature. You gain 3 life."
Last Stand80%
$0.33↑#19048↓0.1625.4 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."
Defile80%
$1.21↑#984↑0.257.4 years↓
"Target creature gets -1/-1 until end of turn for each Swamp you control."
Ground Assault80%
$0.07↓#14549↓0.2113.7 years↓
"this card deals damage to target creature equal to the number of lands you control."
Rumbling Rockslide80%
$0.06↓#17626↓0.38↑6.5 years↓
"this card deals damage to target creature equal to the number of lands you control."
Defibrillating Current78%
$0.17↑#20946↓0.00↓1.5 years↓
"this card deals 4 damage to target creature or planeswalker and you gain 2 life."
Seismic Strike76%
$0.09↓#14074↓0.31↑17.3 years↓
"this card deals damage to target creature equal to the number of Mountains you control."
Spitting Earth76%
$0.06↓#13461↓0.1930.0 years↑
"this card deals damage to target creature equal to the number of Mountains you control."
Earth Tremor76%
$0.16↑#20129↓0.114.4 years↓
"this card deals damage to target creature or planeswalker equal to the number of lands you control."