Triskaidekaphobia 
Enchantment
$0.20 #11096 0.72 10.5 years
At the beginning of your upkeep, choose one —
• Each player with exactly 13 life loses the game, then each player gains 1 life.
• Each player with exactly 13 life loses the game, then each player loses 1 life.
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Cards similar to Triskaidekaphobia 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.
Putrid Warrior92%
$0.09↓#29889↓0.16↓25.4 years↑
"• Each player loses 1 life."
+1 more matching line
Astarion, the Decadent76%
$0.49↑#3755↑0.52↓4.4 years↓
"At the beginning of your end step, choose one —"
+2 more matching lines
Demonic Pact75%
$0.32↑#94371.00↑11.3 years
"At the beginning of your upkeep, choose one that hasn't been chosen —"
+1 more matching line
Angel of Destiny75%
$9.26↑#2944↑0.806.1 years↓
"At the beginning of your end step, if you have at least 15 life more than your starting life total, each player this creature attacked this turn loses the game."
Etherwrought Page74%
$0.22↑#24545↓0.06↓17.5 years↑
"At the beginning of your upkeep, choose one —"
+2 more matching lines
Inquisitor Exarch74%
$0.17↓#21179↓0.00↓15.4 years↑
"• Target opponent loses 2 life."
+2 more matching lines
Skemfar Shadowsage74%
$0.29↑#4589↑0.09↓5.7 years↓
"When this creature enters, choose one —"
+1 more matching line
Phyrexian Unlife74%
$0.65↑#6704↑0.38↓15.4 years↑
"You don't lose the game for having 0 or less life."
Transcendence73%
$6.62↑#121950.53↓24.7 years↑
"You don't lose the game for having 0 or less life."
+1 more matching line
Dogged Pursuit72%
$0.17↓#129220.33↓5.7 years↓
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Drana's Emissary72%
$0.34↑#6763↑0.06↓11.0 years
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Retreat to Hagra72%
$0.54↑#2777↑0.13↓11.0 years
"• Each opponent loses 1 life and you gain 1 life."
Agent of Masks71%
$0.14↓#17946↓0.22↓20.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Subversion71%
$1.92↑#17068↓0.00↓27.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Bond of Agony70%
$1.60↑#15250↓0.30↓20.5 years↑
"Each other player loses X life."
Vampire Neonate70%
$0.13↓#15588↓0.06↓8.3 years↓
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Howling Banshee70%
$0.07↓#25191↓0.05↓17.3 years↑
"When this creature enters, each player loses 3 life."
Maggot Carrier70%
$0.17↓#22894↓0.13↓25.7 years↑
"When this creature enters, each player loses 1 life."
Final Revels70%
$0.15↓#31487↓0.11↓19.0 years↑
"Choose one —"
Centaur Peacemaker70%
$0.13↓#25776↓0.27↓8.0 years↓
"When this creature enters, each player gains 4 life."