Morgul-Knife Wound 

Enchantment — Aura
$0.16 #14214 0.29 3.2 years
Enchant creature
Enchanted creature gets -3/-0 and has "At the beginning of your upkeep, exile this creature unless you pay 2 life."
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Cards similar to Morgul-Knife Wound 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.
Withercrown82%
$0.18↑#18890↓0.295.6 years↑
"Enchanted creature has base power 0 and has "At the beginning of your upkeep, you lose 1 life unless you sacrifice this creature.""
Inevitable End78%
$0.17↑#19406↓0.62↑6.6 years↑
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
+1 more matching line
Pendrell Flux74%
$0.13↓#26887↓0.3627.9 years↑
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
+1 more matching line
Clawing Torment74%
$0.23↑#8551↑0.294.5 years↑
"Enchanted permanent has "At the beginning of your upkeep, you lose 1 life.""
Pillory of the Sleepless72%
$0.11↓#18760↓0.53↑20.6 years↑
"Enchanted creature has "At the beginning of your upkeep, you lose 1 life.""
+1 more matching line
Decomposition72%
$0.13↓#30519↓0.55↑29.9 years↑
"Enchanted creature has "Cumulative upkeep—Pay 1 life.""