Rain of Gore 
Enchantment
$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.
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Cards similar to Rain of Gore 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.
Tainted Remedy95%
$7.82↑#6744↑0.93↑11.3 years↓
"If an opponent would gain life, that player loses that much life instead."
Plague Drone94%
$2.27↓#6672↑0.81↑4.0 years↓
"If an opponent would gain life, that player loses that much life instead."
Sulfuric Vortex88%
$0.86↓#2865↑0.71↑23.4 years↑
"If a player would gain life, that player gains no life instead."
Giant Cindermaw78%
$0.11↓#10971↑0.403.9 years↓
"Players can't gain life."
Tibalt, Rakish Instigator74%
$0.27↓#11220↑0.27↓7.5 years↓
"Your opponents can't gain life."
Archfiend of Despair74%
$4.24↓#2355↑1.06↑8.4 years↓
"Your opponents can't gain life."
Forsaken Wastes74%
$13.99↑#14883↑0.65↑30.0 years↑
"Whenever this enchantment becomes the target of a spell, that spell's controller loses 5 life."
Gríma Wormtongue73%
$0.21↓#9291↑0.27↓3.3 years↓
"Your opponents can't gain life."
Kavu Predator73%
$0.20↓#200240.21↓19.7 years
"Whenever an opponent gains life, put that many +1/+1 counters on this creature."
Rampaging Ferocidon72%
$1.79↓#2650↑0.64↑9.1 years↓
"Players can't gain life."
Knight of Dusk's Shadow71%
$0.29↓#10324↑0.68↑4.1 years↓
"Your opponents can't gain life."
Flames of the Blood Hand71%
$0.26↓#25277↓0.19↓21.7 years↑
"this card deals 4 damage to target player or planeswalker. The damage can't be prevented. If that player or that planeswalker's controller would gain life this turn, that player gains no life instead."
Leyline of Punishment70%
$2.87↓#10681↑0.59↑16.3 years↓
"Players can't gain life."
The Lord of Pain70%
$10.66↑#2477↑0.99↑2.1 years↓
"Your opponents can't gain life."
Everlasting Torment70%
$0.21↓#5271↑0.94↑18.5 years↓
"Players can't gain life."