Malfunction 

Enchantment — Aura
$0.07 #26981 0.13 10.1 years
Enchant artifact or creature
When this Aura enters, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.
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Cards similar to Malfunction 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.
Weakstone's Subjugation99%
$0.11↑#241000.223.9 years↓
"Enchanted permanent doesn't untap during its controller's untap step."
+2 more matching lines
Stuck in Summoner's Sanctum98%
$0.16↑#10769↑0.61↑1.4 years↓
"When this Aura enters, tap enchanted permanent."
+2 more matching lines
Stop Cold98%
$0.16↑#16040↑0.25↑2.5 years↓
"When this Aura enters, tap enchanted permanent."
+2 more matching lines
Ice Over97%
$0.10↑#229350.199.7 years
"Enchanted permanent doesn't untap during its controller's untap step."
+1 more matching line
Coma Veil97%
$0.02↓#304220.2118.0 years↑
"Enchanted permanent doesn't untap during its controller's untap step."
+1 more matching line
Encrust94%
$0.09↑#217340.42↑14.3 years↑
"Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated."
+1 more matching line
Numbing Dose90%
$0.07#286790.1215.4 years↑
"Enchanted permanent doesn't untap during its controller's untap step."
+2 more matching lines
Tamiyo's Compleation85%
$0.20↑#16490↑0.114.7 years↓
"Enchanted permanent loses all abilities and doesn't untap during its controller's untap step."
+2 more matching lines
Sleep with the Fishes85%
$0.22↑#19781↑0.00↓4.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Inertia Bubble84%
$0.04↓#306320.75↑23.0 years↑
"Enchanted artifact doesn't untap during its controller's untap step."
+1 more matching line
Flood the Engine84%
$0.20↑#15811↑0.62↑1.7 years↓
"When this Aura enters, tap enchanted permanent."
+1 more matching line
Waterknot84%
$0.13↑#222110.218.8 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Sleep Paralysis84%
$0.08↑#232090.35↑10.5 years
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Containment Protocol84%
$0.22↑#285890.30↑0.6 years↓
"When this Aura enters, tap enchanted creature."
+2 more matching lines
Claustrophobia84%
$0.04↓#19266↑0.32↑15.1 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Castaway's Despair84%
$0.08↑#264180.219.1 years
"When this Aura enters, tap enchanted creature."
+1 more matching line
Paralyze84%
$0.14↑#20702↑0.80↑33.2 years↑
"When this Aura enters, tap enchanted creature."
+1 more matching line
Charmed Sleep84%
$0.09↑#15858↑0.30↑7.0 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Starlight Snare84%
$0.13↑#20533↑0.93↑1.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line