Weakstone's Subjugation {U}
Enchantment — Aura
Enchant artifact or creature
When this Aura enters, you may pay {3}. If you do, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.
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Cards that do something similar 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.
Tamiyo's Compleation 87%
$0.23#15833
"When this Aura enters, tap enchanted permanent. If it's an Equipment, unattach it."
+1 more matching line
Tractor Beam 86%
$0.17#20147
"When this Aura enters, tap enchanted permanent."
+1 more matching line
Flood the Engine 86%
$0.18#15722
"When this Aura enters, tap enchanted permanent."
+1 more matching line
Psychic Overload 86%
$0.18#30147
"When this Aura enters, tap enchanted permanent."
+1 more matching line
Stuck in Summoner's Sanctum 86%
$0.18#10944
"When this Aura enters, tap enchanted permanent."
+1 more matching line
Numbing Dose 100%
$0.08#28028
"Enchanted permanent doesn't untap during its controller's untap step."
Hold for Questioning 100%
$0.18#20854
"Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated."
+1 more matching line
Encrust 100%
$0.04#21191
"Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated."
Inertia Bubble 81%
$0.06#30214
"Enchanted artifact doesn't untap during its controller's untap step."