Grip of the Roil 
Instant
$0.07 #24074 0.57 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.)Tap target creature. It doesn't untap during its controller's next untap step.
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Cards similar to Grip of the Roil 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.
Crippling Chill96%
$0.03↓#197450.12↓14.3 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Jwar Isle Avenger94%
$0.02↓#258610.29↓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."
Take into Custody94%
$0.05↓#235290.27↓9.6 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Press for Answers94%
$0.05↓#202170.11↓10.4 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Goblin Freerunner94%
$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."
Comparative Analysis91%
$0.06↓#213180.4710.6 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."
Chill of the Grave90%
$0.09↑#19205↑0.25↓4.8 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Rapier Wit90%
$0.20↑#16069↑0.00↓0.4 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
+1 more matching line
Reckless Bushwhacker90%
$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."
Boulder Salvo88%
$0.09↑#264840.35↓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."
Tranquilize88%
$0.17↑#13061↑0.572.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate88%
$0.20↑#13400↑0.00↓0.4 years↓
"Tap target creature. Put twice X stun counters on it."
Pressure Point88%
$0.05↓#14865↑0.07↓11.6 years
"Tap target creature."
+1 more matching line
Tyrant of Valakut88%
$0.15↑#253290.24↓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."
Frostveil Ambush88%
$0.13↑#206760.12↓6.4 years↓
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Decision Paralysis88%
$0.05↓#271420.539.4 years↓
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Frost Breath88%
$0.11↑#17737↑0.5315.1 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Watertrap Weaver88%
$0.06↓#222060.538.9 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx88%
$0.04↓#197630.41↓12.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler88%
$0.11↑#210620.18↓10.4 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."