Curse of Chains 

Enchantment — Aura
$0.21 #17609 0.44 18.3 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↓#188290.62↑16.4 years↓
"At the beginning of each upkeep, if enchanted creature is untapped, tap it."
+1 more matching line
Containment Protocol83%
$0.21#28751↓0.00↓0.5 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Capture Sphere83%
$0.05↓#187020.25↓7.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Starlight Snare83%
$0.13↓#204130.25↓1.8 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Claustrophobia83%
$0.05↓#190770.3614.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep Paralysis83%
$0.06↓#23005↓0.88↑10.4 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Harrier Griffin82%
$0.12↓#25434↓0.33↓20.6 years↑
"At the beginning of your upkeep, tap target creature."
Sleep Magic82%
$0.21#142960.25↓1.2 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sentinel of the Eternal Watch81%
$0.12↓#169820.06↓11.1 years↓
"At the beginning of combat on each opponent's turn, tap target creature that player controls."
Singing Bell Strike80%
$0.04↓#22935↓0.17↓11.9 years↓
"When this Aura enters, tap enchanted creature."