Tangle Kelp 
Enchantment — Aura
$0.72 #31133 0.05 32.1 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%
$0.36↓#305310.47↑32.3 years
"Enchanted creature doesn't untap during its controller's untap step if it has a sleep counter on it."
+2 more matching lines
Kitnap82%
$0.29↓#10567↑0.25↑2.1 years↓
"When this Aura enters, tap enchanted creature. If the gift wasn't promised, put three stun counters on it."
Grasp of the Hieromancer80%
$0.18↓#18920↑0.39↑11.1 years↓
"Enchant creature"
Merseine79%
$0.11↓#287030.24↑31.8 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
Glaring Aegis78%
$0.07↓#17739↑0.0011.4 years↓
"Enchant creature"
+1 more matching line
Curse of Chains78%
$0.21↓#17609↑0.44↑18.3 years↓
"At the beginning of each upkeep, tap enchanted creature."
Burden of Guilt76%
$0.14↓#22246↑0.21↑14.6 years↓
"Enchant creature"
+1 more matching line
Castaway's Despair75%
$0.09↓#265830.53↑8.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Claustrophobia74%
$0.05↓#19077↑0.36↑14.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Containment Protocol74%
$0.21↓#287510.000.5 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Sleep Paralysis74%
$0.06↓#23005↑0.88↑10.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Capture Sphere74%
$0.05↓#18702↑0.25↑7.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Starlight Snare74%
$0.13↓#20413↑0.25↑1.8 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Sleep with the Fishes74%
$0.18↓#19563↑0.27↑4.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines
Waterknot74%
$0.12↓#21884↑0.25↑8.6 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Charmed Sleep74%
$0.07↓#15562↑0.25↑6.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Paralyze74%
$0.13↓#20525↑0.57↑33.1 years
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Thundermare74%
$0.89↑#18811↑0.1429.3 years↓
"When this creature enters, tap all other creatures."
Shrieking Mogg74%
$0.52↓#251180.88↑26.6 years↓
"When this creature enters, tap all other creatures."
Sleep Magic74%
$0.21↓#14296↑0.25↑1.2 years↓
"Enchanted creature doesn't untap during its controller's untap step."
+2 more matching lines