Withercrown 

Enchantment — Aura
$0.17 #19145 0.29 5.7 years
Enchant creature
Enchanted creature has base power 0 and has "At the beginning of your upkeep, you lose 1 life unless you sacrifice this creature."
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Cards similar to Withercrown 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.
Inevitable End86%
$0.20↑#196930.55↑6.7 years↑
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
Morgul-Knife Wound82%
$0.20↑#14413↑0.18↓3.3 years↓
"Enchanted creature gets -3/-0 and has "At the beginning of your upkeep, exile this creature unless you pay 2 life.""
+1 more matching line
Clawing Torment78%
$0.17#8746↑0.14↓4.7 years↓
"Enchanted permanent has "At the beginning of your upkeep, you lose 1 life.""
Decomposition78%
$0.10↓#30766↓0.00↓30.0 years↑
"Enchanted creature has "Cumulative upkeep—Pay 1 life.""
Vile Consumption78%
$10.46↑#13643↑1.14↑26.0 years↑
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay 1 life.""
Pendrell Flux77%
$0.12↓#27248↓0.47↑28.0 years↑
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
Soul Bleed77%
$0.09↓#27940↓0.06↓17.3 years↑
"At the beginning of the upkeep of enchanted creature's controller, that player loses 1 life."