Curse of Chains 
Enchantment — Aura
$0.23 #17819 0.25 18.5 years
Enchant creature
At the beginning of each upkeep, tap enchanted creature.
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Cards similar to Curse of Chains 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.
Narcolepsy96%
$0.06↓#190850.47↑16.5 years↓
"At the beginning of each upkeep, if enchanted creature is untapped, tap it."
Burden of Guilt94%
$0.13↓#22454↓0.3214.7 years↓
": Tap enchanted creature."
: Tap enchanted creature."
Debtor's Pulpit86%
$0.05↓#26934↓0.06↓13.7 years↓
"Enchanted land has "
: Tap target creature.""
: Tap target creature.""
Octopus Umbra84%
$1.83↑#10118↑0.40↑8.2 years↓
"Enchant creature"
Starlight Snare83%
$0.13↓#205330.93↑1.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Paralyze83%
$0.14↓#207020.80↑33.2 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Charmed Sleep83%
$0.09↓#158580.307.0 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Claustrophobia83%
$0.04↓#192660.3215.1 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Capture Sphere83%
$0.05↓#190040.218.0 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Waterknot83%
$0.13↓#22211↓0.218.8 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Castaway's Despair83%
$0.08↓#26418↓0.219.1 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Containment Protocol83%
$0.22↓#28589↓0.300.6 years↓
"When this Aura enters, tap enchanted creature."
Sleep Paralysis83%
$0.08↓#23209↓0.3510.5 years↓
"When this Aura enters, tap enchanted creature."
Harrier Griffin82%
$0.13↓#25786↓0.1820.7 years↑
"At the beginning of your upkeep, tap target creature."
Glaring Aegis82%
$0.07↓#180470.06↓11.6 years↓
"Enchant creature"
Sleep Magic82%
$0.21↓#142560.201.4 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sentinel of the Eternal Watch81%
$0.11↓#173720.44↑11.3 years↓
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
So Shiny81%
$0.16↓#26279↓0.06↓5.3 years↓
"Enchant creature"
Unquenchable Thirst80%
$0.08↓#29986↓0.40↑9.3 years↓
"Enchant creature"
Singing Bell Strike80%
$0.04↓#23150↓0.12↓12.1 years↓
"When this Aura enters, tap enchanted creature."