Enduring Tenacity 
Enchantment Creature — Snake Glimmer
$11.84 #813 0.68 1.9 years
Whenever you gain life, target opponent loses that much life.
When Enduring Tenacity dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)
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Cards similar to Enduring Tenacity 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.
Sanguine Bond95%
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Enduring Courage92%
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"When this card dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment."
Enduring Curiosity90%
$6.60↓#8160.42↓1.9 years
"When this card dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment."
Vito, Thorn of the Dusk Rose89%
$10.17↓#494↑0.95↑6.2 years↑
"Whenever you gain life, target opponent loses that much life."
Enduring Innocence88%
$4.23↓#7400.29↓1.9 years
"When this card dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment."
Enduring Vitality87%
$13.61↑#431↑0.33↓1.9 years
"When this card dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment."
Marauding Blight-Priest86%
$0.19↓#1113↓0.33↓5.9 years↑
"Whenever you gain life, each opponent loses 1 life."
Epicure of Blood86%
$0.10↓#6929↓0.29↓8.1 years↑
"Whenever you gain life, each opponent loses 1 life."
Cliffhaven Vampire86%
$0.78↓#4999↓0.36↓10.6 years↑
"Whenever you gain life, each opponent loses 1 life."
Tenacious Dead86%
$0.14↓#13307↓0.29↓13.1 years↑
"When this creature dies, you may pay 
. If you do, return it to the battlefield tapped under its owner's control."
. If you do, return it to the battlefield tapped under its owner's control."
Geralf's Messenger82%
$3.22↓#8101↓0.25↓14.6 years↑
"When this creature enters, target opponent loses 2 life."
+1 more matching line
Indulging Patrician81%
$0.33↓#4282↓0.19↓6.2 years↑
"At the beginning of your end step, if you gained 3 or more life this turn, each opponent loses 3 life."
Dina, Soul Steeper80%
$0.22↓#2748↓0.40↓5.4 years↑
"Whenever you gain life, each opponent loses 1 life."
Phytotitan80%
$0.71↓#9018↓0.00↓12.1 years↑
"When this creature dies, return it to the battlefield tapped under its owner's control at the beginning of their next upkeep."
South Wind Avatar80%
$1.50↓#6104↓0.00↓0.5 years↓
"Whenever you gain life, each opponent loses 1 life."
Accursed Witch // Infectious Curse78%
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"When this creature dies, return it to the battlefield transformed under your control attached to target opponent."
Vizkopa Guildmage78%
$0.40↓#4458↓0.45↓13.6 years↑
"
: Whenever you gain life this turn, each opponent loses that much life."
: Whenever you gain life this turn, each opponent loses that much life."
Defiling Daemogoth78%
$0.77↓#7225↓0.00↓0.4 years↓
"At the beginning of your end step, each opponent loses X life, where X is the amount of life you gained this turn."
Harvest Hand // Scrounged Scythe78%
$0.17↓#17851↓0.06↓10.4 years↑
"When this creature dies, return it to the battlefield transformed under your control."