Roots of Life 
Enchantment
$0.33 #20407 0.35 30.0 years
As this enchantment enters, choose Island or Swamp.
Whenever a land of the chosen type an opponent controls becomes tapped, you gain 1 life.
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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.
Thoughtleech93%
$0.22↓#25083↓0.3631.4 years↑
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Lifeblood86%
$20.64↑#30814↓0.2732.4 years↑
"Whenever a Mountain an opponent controls becomes tapped, you gain 1 life."
Marshdrinker Giant86%
$0.11↓#30524↓0.50↑18.2 years↓
"When this creature enters, destroy target Island or Swamp an opponent controls."
Lifetap84%
$0.19↓#211270.06↓33.2 years↑
"Whenever a Forest an opponent controls becomes tapped, you gain 1 life."
Scald78%
$0.29↓#25731↓1.12↑28.0 years↓
"Whenever a player taps an Island for mana, this enchantment deals 1 damage to that player."
Wanderbrine Preacher78%
$0.17↓#177990.12↓0.7 years↓
"Whenever this creature becomes tapped, you gain 2 life."
Vampire Envoy78%
$0.12↓#192230.00↓10.7 years↓
"Whenever this creature becomes tapped, you gain 1 life."
Sanctimony74%
$0.10↓#26466↓0.06↓27.4 years↓
"Whenever an opponent taps a Mountain for mana, you may gain 1 life."
Spreading Algae74%
$0.22↓#239810.3828.0 years↓
"When enchanted land becomes tapped, destroy it."
Gideon's Avenger72%
$0.69↑#14609↑0.3815.3 years↓
"Whenever a creature an opponent controls becomes tapped, put a +1/+1 counter on this creature."
Powerleech72%
$20.88↑#216240.3332.6 years↑
"Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without 
in its activation cost, you gain 1 life."
in its activation cost, you gain 1 life."
Emmara, Soul of the Accord71%
$0.32↓#6681↑0.12↓8.0 years↓
"Whenever this card becomes tapped, create a 1/1 white Soldier creature token with lifelink."
Chrome Companion70%
$0.25↓#9903↑0.21↓1.2 years↓
"Whenever this creature becomes tapped, you gain 1 life."
Mana Web70%
$18.07↑#11750↑1.64↑29.4 years
"Whenever a land an opponent controls is tapped for mana, tap all lands that player controls that could produce any type of mana that land could produce."
Blight70%
$0.25↓#243570.72↑32.4 years↑
"When enchanted land becomes tapped, destroy it."