Grip of the Roil 
Instant
$0.05 #24388 0.13 10.7 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↓#200020.2014.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Jwar Isle Avenger95%
$0.03↓#257450.0710.7 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 Freerunner94%
$0.06↑#231780.0510.7 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."
Press for Answers93%
$0.06↑#205460.1210.5 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Take into Custody92%
$0.04↓#238460.069.7 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Comparative Analysis92%
$0.06↑#214780.00↓10.7 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."
Reckless Bushwhacker90%
$0.17↑#16071↑0.00↓10.7 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."
Rapier Wit90%
$0.16↑#15248↑0.200.5 years↓
"Tap target creature. If it's your turn, put a stun counter on it."
+1 more matching line
Chill of the Grave90%
$0.10↑#19451↑0.00↓4.9 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Boulder Salvo90%
$0.09↑#268270.0510.7 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."
Tyrant of Valakut88%
$0.15↑#255630.00↓10.7 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."
Fall of the Titans88%
$0.30↑#10967↑0.00↓10.7 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."
Overwhelming Denial88%
$0.23↑#16244↑0.1010.7 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%
$0.14↑#13245↑0.26↑2.3 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Decision Paralysis87%
$0.05#273970.209.5 years↓
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Frostveil Ambush87%
$0.17↑#210210.136.5 years↓
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Frost Breath87%
$0.07↑#18110↑0.29↑15.3 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Frost Lynx87%
$0.04↓#200630.27↑12.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler87%
$0.13↑#213360.31↑10.5 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver87%
$0.08↑#224630.39↑9.1 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."