Lifeblood 
Enchantment
$20.64 #30814 0.27 32.4 years
Whenever a Mountain an opponent controls becomes tapped, you gain 1 life.
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Cards similar to Lifeblood expected a card that isn't here?
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Sanctimony96%
$0.10↓#264660.06↓27.4 years↓
"Whenever an opponent taps a Mountain for mana, you may gain 1 life."
Thoughtleech90%
$0.22↓#250830.3631.4 years↓
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Lifetap88%
$0.19↓#21127↑0.06↓33.2 years
"Whenever a Forest an opponent controls becomes tapped, you gain 1 life."
Roots of Life86%
$0.33↓#20407↑0.3530.0 years↓
"Whenever a land of the chosen type an opponent controls becomes tapped, you gain 1 life."
Wanderbrine Preacher82%
$0.17↓#17799↑0.12↓0.7 years↓
"Whenever this creature becomes tapped, you gain 2 life."
Vampire Envoy81%
$0.12↓#19223↑0.00↓10.7 years↓
"Whenever this creature becomes tapped, you gain 1 life."
Renewing Dawn80%
$0.39↓#318370.00↓29.5 years↓
"You gain 2 life for each Mountain target opponent controls."
Gideon's Avenger76%
$0.69↓#14609↑0.38↑15.3 years↓
"Whenever a creature an opponent controls becomes tapped, put a +1/+1 counter on this creature."
Emmara, Soul of the Accord75%
$0.32↓#6681↑0.12↓8.0 years↓
"Whenever this card becomes tapped, create a 1/1 white Soldier creature token with lifelink."
Chrome Companion74%
$0.25↓#9903↑0.211.2 years↓
"Whenever this creature becomes tapped, you gain 1 life."
Powerleech74%
$20.88↑#21624↑0.3332.6 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."
Wylie Duke, Atiin Hero72%
$0.29↓#7986↑0.06↓2.5 years↓
"Whenever this card becomes tapped, you gain 1 life and draw a card."
Royal Decree72%
$0.73↓#264440.45↑30.4 years↓
"Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, this enchantment deals 1 damage to that permanent's controller."
Night Market Lookout70%
$0.17↓#13146↑0.00↓10.1 years↓
"Whenever this creature becomes tapped, each opponent loses 1 life and you gain 1 life."
Blight70%
$0.25↓#24357↑0.72↑32.4 years
"When enchanted land becomes tapped, destroy it."