Triskaidekaphobia 

Enchantment
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.
click a line to search just that ability, click more to combine them
Cards that do something similar 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.
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"At the beginning of your upkeep, choose one —"
+2 more matching lines
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"At the beginning of your upkeep, choose one —"
+1 more matching line
Quiet Disrepair 100%
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"At the beginning of your upkeep, choose one —"
+1 more matching line
Energy Chamber 100%
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"At the beginning of your upkeep, choose one —"
+1 more matching line
Demonic Pact 91%
$0.33#9457
"At the beginning of your upkeep, choose one that hasn't been chosen —"
+1 more matching line