Leaden Fists 

Enchantment — Aura
$0.05 #28706 0.35 19.3 years
Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature gets +3/+3 and doesn't untap during its controller's untap step.
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Cards similar to Leaden Fists 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.
Paralyzing Grasp90%
$0.05#251440.04↓16.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bonds of Quicksilver90%
$0.05#273560.20↓15.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Dehydration90%
$0.06↑#287500.2526.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Frozen Solid88%
$0.08↑#254950.47↑23.3 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Gift of Strands86%
$0.13↑#17015↑0.00↓3.2 years↓
"Enchanted creature gets +3/+3."
+1 more matching line
Sleep Paralysis86%
$0.06↑#230050.88↑10.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Paralyze86%
$0.13↑#20525↑0.57↑33.1 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Capture Sphere86%
$0.05#18702↑0.257.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Claustrophobia86%
$0.05#19077↑0.3614.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Charmed Sleep86%
$0.07↑#15562↑0.256.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Starlight Snare86%
$0.13↑#20413↑0.251.8 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Containment Protocol86%
$0.21↑#287510.00↓0.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Waterknot86%
$0.12↑#21884↑0.258.6 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Eternity Snare86%
$0.05#291950.2919.9 years
"Enchanted creature doesn't untap during its controller's untap step."
Sleep with the Fishes85%
$0.18↑#19563↑0.274.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line