Sand Squid {3}{U}
Creature — Squid Beast
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
You may choose not to untap this creature during your untap step.
{T}: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped.
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Cards that do something similar 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.
Zhalfirin Decoy 99%
$0.17#28489
"{T}: Tap target creature. Activate only if you had a creature enter the battlefield under your control this turn."
Everglove Courier 100%
$0.09#29550
"You may choose not to untap this creature during your untap step."
Frightshroud Courier 100%
$0.15#29794
"You may choose not to untap this creature during your untap step."
Willow Satyr 100%
#23942
"You may choose not to untap this creature during your untap step."
+1 more matching line
Seasinger 100%
#20718
"You may choose not to untap this creature during your untap step."
+1 more matching line
Flamestick Courier 100%
$0.07#29066
"You may choose not to untap this creature during your untap step."
Ghosthelm Courier 100%
$0.20#28584
"You may choose not to untap this creature during your untap step."
Hedge Whisperer 100%
$0.07#25634
"You may choose not to untap this creature during your untap step."
Thalakos Dreamsower 100%
$0.24#26910
"You may choose not to untap this creature during your untap step."
Pearlspear Courier 100%
$0.09#31145
"You may choose not to untap this creature during your untap step."
Altar Golem 94%
$0.50#20213
"This creature doesn't untap during your untap step."
+1 more matching line
Colossus of Sardia 94%
#22807
"This creature doesn't untap during your untap step."
+1 more matching line