Sanctimony 
Enchantment
$0.10 #26466 0.06 27.4 years
Whenever an opponent taps a Mountain for mana, you may gain 1 life.
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Cards similar to Sanctimony 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.
Lifeblood96%
$20.64↑#308140.27↑32.4 years↑
"Whenever a Mountain an opponent controls becomes tapped, you gain 1 life."
Renewing Dawn82%
$0.39↑#31837↓0.0029.5 years↑
"You gain 2 life for each Mountain target opponent controls."
Thoughtleech76%
$0.22↑#250830.36↑31.4 years↑
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Lifetap76%
$0.19↑#21127↑0.0633.2 years↑
"Whenever a Forest an opponent controls becomes tapped, you gain 1 life."
Roots of Life74%
$0.33↑#20407↑0.35↑30.0 years↑
"Whenever a land of the chosen type an opponent controls becomes tapped, you gain 1 life."