Sealock Monster 
Creature — Octopus
$0.09 #22812 0.00 12.9 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.
Armored Galleon92%
$1.07↑#29921↓0.52↑28.2 years↑
"This creature can't attack unless defending player controls an Island."
Steam Frigate92%
$0.24↑#30672↓0.0628.2 years↑
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent92%
$0.35↑#30402↓0.0029.3 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster92%
$0.03↓#28535↓0.25↑28.9 years↑
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada92%
$11.26↑#30986↓0.40↑27.3 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark92%
$0.17↑#250780.0728.5 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship92%
$1.97↑#30205↓0.0027.3 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander92%
$150.00↑#29454↓0.27↑27.3 years↑
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill92%
$0.11↑#30732↓0.0018.9 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent90%
$0.19↑#30144↓0.0025.9 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Eel88%
$0.06↓#260520.21↑23.9 years↑
"This creature can't attack unless defending player controls an Island."
Manta Ray88%
$0.13↑#247400.0729.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Sea Serpent88%
$0.09#28803↓0.24↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Slipstream Serpent87%
$0.04↓#29080↓0.17↑19.9 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ravenous Leucrocota86%
$0.10↑#29901↓0.24↑12.3 years
"
: Monstrosity 3."
: Monstrosity 3."
Ill-Tempered Cyclops86%
$0.04↓#29489↓0.0012.9 years
"
: Monstrosity 3."
: Monstrosity 3."
Nessian Asp86%
$0.05↓#232140.21↑12.9 years
": Monstrosity 4."
: Monstrosity 4."
Goblin Rock Sled86%
$0.07↓#30897↓0.19↑32.1 years↑
"This creature can't attack unless defending player controls a Mountain."
Fleetfeather Cockatrice86%
$0.13↑#258760.47↑12.3 years
": Monstrosity 3."
: Monstrosity 3."
Gluttonous Cyclops86%
$0.06↓#30142↓0.25↑12.3 years
": Monstrosity 3."
: Monstrosity 3."