Tainted Remedy 
Enchantment
$7.82 #6744 0.93 11.3 years
If an opponent would gain life, that player loses that much life instead.
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Cards similar to Tainted Remedy 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.
Rain of Gore95%
$7.49↓#19441↓0.47↓20.5 years↑
"If a spell or ability would cause its controller to gain life, that player loses that much life instead."
Plague Drone94%
$2.27↓#66720.81↓4.0 years↓
"If an opponent would gain life, that player loses that much life instead."
Sulfuric Vortex85%
$0.86↓#2865↑0.71↓23.4 years↑
"If a player would gain life, that player gains no life instead."
Kavu Predator70%
$0.20↓#20024↓0.21↓19.7 years↑
"Whenever an opponent gains life, put that many +1/+1 counters on this creature."