Containment Membrane 
Enchantment — Aura
$0.07 #25183 0.32 10.6 years
Surge (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)
(You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
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Cards similar to Containment Membrane 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.
Mesmerizing Dose96%
$0.20↑#9969↑0.11↓3.6 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Bubble Snare96%
$0.13↑#207740.07↓5.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Plumes of Peace95%
$0.14↑#253530.44↑21.0 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Sinking Feeling94%
$0.15↑#278400.06↓18.3 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Melancholy94%
$0.10↑#30941↓0.07↓19.6 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Stay Hidden, Stay Silent92%
$0.11↑#17404↑0.21↓1.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
So Shiny92%
$0.17↑#260120.22↓5.2 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bitter Chill92%
$0.25↑#13091↑0.18↓3.0 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Unquenchable Thirst92%
$0.06↓#296490.20↓9.1 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Watery Grasp91%
$0.17↑#9652↑0.00↓0.8 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Jwar Isle Avenger90%
$0.02↓#258610.2910.6 years
"Surge You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
Goblin Freerunner90%
$0.06↓#229200.10↓10.6 years
"Surge 
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
Paralyzing Grasp88%
$0.05↓#251440.04↓16.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Dehydration88%
$0.06↓#287500.2526.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Bonds of Quicksilver88%
$0.05↓#273560.20↓15.9 years↑
"Enchanted creature doesn't untap during its controller's untap step."
Fall from Favor88%
$0.20↑#14880↑0.50↑5.8 years↓
"Enchanted creature doesn't untap during its controller's untap step unless that player is the monarch."
Boulder Salvo88%
$0.09↑#264840.3510.6 years
"Surge You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
Winter's Rest88%
$0.27↑#12743↑0.45↑7.2 years↓
"Enchant creature"
Reckless Bushwhacker87%
$0.19↑#15843↑0.16↓10.6 years
"Surge You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
Comparative Analysis86%
$0.06↓#213180.47↑10.6 years
"Surge You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."
You may cast this spell for its surge cost if you or a teammate has cast another spell this turn."