Spirit Link 
Enchantment — Aura
$0.25 #3098 0.10 32.3 years
Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Whenever enchanted creature deals damage, you gain that much life.
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Cards similar to Spirit Link 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.
Vampiric Link100%
$2.67↑#5437↓0.25↑19.6 years↓
"Whenever enchanted creature deals damage, you gain that much life."
+1 more matching line
Armadillo Cloak99%
$1.01↑#5474↓0.29↑25.9 years↓
"Whenever enchanted creature deals damage, you gain that much life."
+1 more matching line
Soul Link98%
$0.27↑#17485↓0.39↑25.3 years↓
"Whenever enchanted creature deals damage, you gain that much life."
Spirit Loop98%
$12.10↑#6683↓0.1819.9 years↓
"Whenever enchanted creature deals damage, you gain that much life."
El-Hajjâj92%
$0.39↑#30836↓0.36↑32.7 years
"Whenever this creature deals damage, you gain that much life."
Warrior Angel92%
$0.61↑#29266↓0.27↑28.5 years↓
"Whenever this creature deals damage, you gain that much life."
Zebra Unicorn92%
$0.35↑#23559↓0.24↑29.9 years↓
"Whenever this creature deals damage, you gain that much life."
Kjeldoran Gargoyle92%
$0.11↓#27050↓0.00↓20.1 years↓
"Whenever this creature deals damage, you gain that much life."
Horned Cheetah92%
$0.21↓#29742↓0.44↑25.9 years↓
"Whenever this creature deals damage, you gain that much life."
Mourning Thrull92%
$0.05↓#24343↓0.47↑20.6 years↓
"Whenever this creature deals damage, you gain that much life."
Paladin of Prahv89%
$0.12↓#26711↓0.44↑20.3 years↓
"Whenever this creature deals damage, you gain that much life."
Exalted Angel88%
$1.33↑#15132↓0.1923.9 years↓
"Whenever this creature deals damage, you gain that much life."
Noble Purpose88%
$0.23↓#15480↓0.25↑26.9 years↓
"Whenever a creature you control deals combat damage, you gain that much life."
Phantom Nishoba87%
$0.25#14072↓0.1724.3 years↓
"Whenever this creature deals damage, you gain that much life."
Sunhome Enforcer85%
$0.24↓#27523↓0.0620.9 years↓
"Whenever this creature deals combat damage, you gain that much life."
Stir the Pride84%
$0.16↓#27421↓0.32↑22.6 years↓
"• Until end of turn, creatures you control gain "Whenever this creature deals damage, you gain that much life.""
Doubtless One82%
$0.21↓#21524↓0.1723.9 years↓
"Whenever this creature deals damage, you gain that much life."
Spiritualize78%
$0.34↑#23104↓0.0724.9 years↓
"Until end of turn, whenever target creature deals damage, you gain that much life."
Tamanoa78%
$1.07↑#25675↓0.0620.1 years↓
"Whenever a noncreature source you control deals damage, you gain that much life."
Essence Sliver77%
$7.92↑#8487↓0.32↑23.6 years↓
"Whenever a Sliver deals damage, its controller gains that much life."