Tangle Kelp 
Enchantment — Aura
$0.67 #31456 0.23 32.2 years
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step if it attacked during its controller's last turn.
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Cards similar to Tangle Kelp 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.
Venarian Gold88%
$0.38↓#308820.37↑32.4 years
"Enchanted creature doesn't untap during its controller's untap step if it has a sleep counter on it."
+1 more matching line
Grasp of the Hieromancer80%
$0.19↓#19246↑0.00↓11.3 years↓
"Enchant creature"
Merseine79%
$0.11↓#290440.39↑32.0 years
"Enchanted creature doesn't untap during its controller's untap step if this Aura has a net counter on it."
+1 more matching line
Colossification78%
$0.50↓#4111↑0.256.5 years↓
"When this Aura enters, tap enchanted creature."
Glaring Aegis78%
$0.07↓#18047↑0.06↓11.6 years↓
"When this Aura enters, tap target creature an opponent controls."
+1 more matching line
Curse of Chains78%
$0.23↓#17819↑0.2518.5 years↓
"At the beginning of each upkeep, tap enchanted creature."
+1 more matching line
Kitnap77%
$0.25↓#10870↑0.36↑2.2 years↓
"Enchant creature"
+1 more matching line
Burden of Guilt76%
$0.13↓#22454↑0.3214.7 years↓
"
: Tap enchanted creature."
: Tap enchanted creature."
Frozen in Ice75%
$0.17↓#14306↑0.45↑0.3 years↓
"When this Aura enters, tap enchanted creature."
Psychic Impetus75%
$0.15↓#7137↑0.306.5 years↓
"Enchant creature"
Starlight Snare74%
$0.13↓#20533↑0.93↑1.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Paralyze74%
$0.14↓#20702↑0.80↑33.2 years
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Charmed Sleep74%
$0.09↓#15858↑0.307.0 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Claustrophobia74%
$0.04↓#19266↑0.3215.1 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Capture Sphere74%
$0.05↓#19004↑0.218.0 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Waterknot74%
$0.13↓#22211↑0.218.8 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Castaway's Despair74%
$0.08↓#264180.219.1 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Containment Protocol74%
$0.22↓#285890.300.6 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Sleep Paralysis74%
$0.08↓#23209↑0.35↑10.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Sleep with the Fishes74%
$0.22↓#19781↑0.00↓4.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line