Charmed Sleep 
Enchantment — Aura
$0.09 #15858 0.30 7.0 years
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
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Cards similar to Charmed Sleep 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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$0.13↑#20533↓0.93↑1.9 years↓
"When this Aura enters, tap enchanted creature."
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"When this Aura enters, tap enchanted creature."
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"When this Aura enters, tap enchanted creature."
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$0.13↑#22211↓0.218.8 years↑
"When this Aura enters, tap enchanted creature."
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Castaway's Despair100%
$0.08↓#26418↓0.219.1 years↑
"When this Aura enters, tap enchanted creature."
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Containment Protocol100%
$0.22↑#28589↓0.300.6 years↓
"When this Aura enters, tap enchanted creature."
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Sleep Paralysis100%
$0.08↓#23209↓0.3510.5 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep with the Fishes100%
$0.22↑#19781↓0.00↓4.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Sleep Magic99%
$0.21↑#142560.201.4 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Singing Bell Strike98%
$0.04↓#23150↓0.12↓12.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Bind the Monster98%
$0.21↑#23430↓0.235.7 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Roots98%
$0.15↑#29204↓0.2231.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Frozen in Ice98%
$0.17↑#143060.45↑0.3 years↓
"When this Aura enters, tap enchanted creature."
Dehydration98%
$0.04↓#29007↓0.47↑27.0 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Paralyzing Grasp98%
$0.06↓#25494↓0.56↑17.0 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bonds of Quicksilver98%
$0.04↓#27616↓0.2516.1 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Ringing Strike Mastery97%
$0.10↑#143610.07↓1.5 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Dramatic Accusation97%
$0.07↓#188780.73↑2.7 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Thirst97%
$0.05↓#31651↓0.3530.0 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line