Waterknot 
Enchantment — Aura
$0.12 #21884 0.25 8.6 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 Waterknot 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.
Charmed Sleep100%
$0.07↓#15562↑0.256.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep Paralysis100%
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"When this Aura enters, tap enchanted creature."
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Containment Protocol100%
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"When this Aura enters, tap enchanted creature."
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Claustrophobia100%
$0.05↓#190770.36↑14.9 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Paralyze100%
$0.13↑#205250.57↑33.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Capture Sphere100%
$0.05↓#187020.257.9 years
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Starlight Snare100%
$0.13↑#204130.251.8 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Castaway's Despair100%
$0.09↓#26583↓0.53↑8.9 years
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep with the Fishes100%
$0.18↑#195630.274.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Sleep Magic99%
$0.21↑#14296↑0.251.2 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Singing Bell Strike98%
$0.04↓#229350.1711.9 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Bind the Monster98%
$0.20↑#230280.335.6 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Roots98%
$0.11↓#28910↓0.38↑30.9 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Frozen in Ice98%
$0.18↑#15735↑0.00↓0.2 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Bonds of Quicksilver98%
$0.05↓#27356↓0.2015.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Paralyzing Grasp98%
$0.05↓#251440.04↓16.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Dehydration98%
$0.06↓#28750↓0.2526.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Dramatic Accusation97%
$0.08↓#185560.352.6 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Thirst97%
$0.08↓#31338↓0.62↑29.9 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Ringing Strike Mastery97%
$0.13↑#14371↑0.37↑1.4 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line