Castaway's Despair 

Enchantment — Aura
$0.08 #26418 0.21 9.1 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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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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"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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"When this Aura enters, tap enchanted creature."
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"When this Aura enters, tap enchanted creature."
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$0.13↑#222110.218.8 years
"When this Aura enters, tap enchanted creature."
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Containment Protocol100%
$0.22↑#285890.300.6 years↓
"When this Aura enters, tap enchanted creature."
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Sleep Paralysis100%
$0.08#232090.35↑10.5 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↑#14256↑0.201.4 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Singing Bell Strike98%
$0.04↓#231500.1212.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Bind the Monster98%
$0.21↑#234300.235.7 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Roots98%
$0.15↑#292040.2231.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Dehydration98%
$0.04↓#290070.47↑27.0 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Paralyzing Grasp98%
$0.06↓#254940.56↑17.0 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bonds of Quicksilver98%
$0.04↓#276160.2516.1 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Ringing Strike Mastery97%
$0.10↑#14361↑0.07↓1.5 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Dramatic Accusation97%
$0.07↓#18878↑0.73↑2.7 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line