Sleep Magic 
Enchantment — Aura
$0.21 #14256 0.20 1.4 years
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
When enchanted creature is dealt damage, sacrifice this Aura.
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Cards similar to Sleep Magic 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.
Starlight Snare99%
$0.13↓#20533↓0.93↑1.9 years
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Paralyze99%
$0.14↓#20702↓0.80↑33.2 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Charmed Sleep99%
$0.09↓#158580.307.0 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Claustrophobia99%
$0.04↓#19266↓0.32↑15.1 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Capture Sphere99%
$0.05↓#19004↓0.218.0 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Waterknot99%
$0.13↓#22211↓0.218.8 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Castaway's Despair99%
$0.08↓#26418↓0.219.1 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Containment Protocol99%
$0.22↑#28589↓0.300.6 years
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep Paralysis99%
$0.08↓#23209↓0.35↑10.5 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep with the Fishes98%
$0.22↑#19781↓0.00↓4.5 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Thirst98%
$0.05↓#31651↓0.35↑30.0 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Bind the Monster97%
$0.21#23430↓0.235.7 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bonds of Quicksilver97%
$0.04↓#27616↓0.2516.1 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Roots96%
$0.15↓#29204↓0.2231.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Ringing Strike Mastery96%
$0.10↓#143610.07↓1.5 years
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Locked in the Cemetery96%
$0.06↓#24853↓0.39↑5.1 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Mystic Restraints96%
$0.10↓#29861↓0.00↓22.1 years↑
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Melancholy95%
$0.07↓#31250↓0.00↓19.7 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line