Sealock Monster 
Creature — Octopus
$0.08 #23116 0.20 13.1 years
This creature can't attack unless defending player controls an Island.
: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)When this creature becomes monstrous, target land becomes an Island in addition to its other types.
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Cards similar to Sealock Monster 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.
Steam Frigate92%
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"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada92%
$10.74↑#31219↓0.05↓27.5 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster92%
$0.05↓#28803↓0.00↓29.0 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship92%
$1.97↑#30474↓0.1227.5 years↑
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent92%
$0.39↑#30650↓0.31↑29.5 years↑
"This creature can't attack unless defending player controls an Island."
Armored Galleon92%
$1.07↑#30062↓0.00↓28.3 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark92%
$0.17↑#253920.00↓28.6 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander92%
$150.00↑#29715↓0.2627.5 years↑
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill92%
$0.25↑#31062↓0.00↓19.0 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent90%
$0.20↑#30395↓0.2526.0 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Eel88%
$0.06↓#264140.05↓24.0 years↑
"This creature can't attack unless defending player controls an Island."
Manta Ray88%
$0.15↑#250540.00↓29.4 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Sea Serpent88%
$0.10↑#29077↓0.44↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ravenous Leucrocota86%
$0.07↓#30185↓0.00↓12.5 years
"
: Monstrosity 3."
: Monstrosity 3."
Ill-Tempered Cyclops86%
$0.04↓#29755↓0.00↓13.1 years
"
: Monstrosity 3."
: Monstrosity 3."
Nessian Asp86%
$0.04↓#235860.06↓13.1 years
": Monstrosity 4."
: Monstrosity 4."
Slipstream Serpent86%
$0.04↓#29362↓0.1220.0 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Goblin Rock Sled86%
$0.07↓#31164↓0.00↓32.2 years↑
"This creature can't attack unless defending player controls a Mountain."
Fleetfeather Cockatrice86%
$0.12↑#262720.1312.5 years
": Monstrosity 3."
: Monstrosity 3."
Gluttonous Cyclops86%
$0.14↑#30472↓0.00↓12.5 years
": Monstrosity 3."
: Monstrosity 3."