Delvefall
Leviathan

Leviathan {5}{U}{U}{U}{U}

Creature — Leviathan

Trample
This creature enters tapped and doesn't untap during your untap step.
At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap this creature.
This creature can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)

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Cards that do something similar expected a card that isn't here?

Harbor Serpent
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Floodchaser
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"This creature can't attack unless defending player controls an Island."
Manta Ray
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"This creature can't attack unless defending player controls an Island."
Armored Galleon
Armored Galleon 86%
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"This creature can't attack unless defending player controls an Island."
Vodalian Knights
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"This creature can't attack unless defending player controls an Island."
Wu Warship
Wu Warship 86%
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"This creature can't attack unless defending player controls an Island."
Hammerhead Shark
Hammerhead Shark 86%
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"This creature can't attack unless defending player controls an Island."
Sea Serpent
Sea Serpent 86%
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"This creature can't attack unless defending player controls an Island."
Marjhan
Marjhan 86%
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"This creature can't attack unless defending player controls an Island."
+1 more matching line
Sea Monster
Sea Monster 86%
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"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada
Red Cliffs Armada 86%
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"This creature can't attack unless defending player controls an Island."
Dandân
Dandân 86%
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"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent
Deep-Sea Serpent 86%
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"This creature can't attack unless defending player controls an Island."
Slipstream Eel
Slipstream Eel 86%
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"This creature can't attack unless defending player controls an Island."
Merchant Ship
Merchant Ship 86%
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"This creature can't attack unless defending player controls an Island."
Kukemssa Serpent
Kukemssa Serpent 86%
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"This creature can't attack unless defending player controls an Island."
Giant Shark
Giant Shark 86%
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"This creature can't attack unless defending player controls an Island."
Ethereal Whiskergill
Ethereal Whiskergill 86%
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"This creature can't attack unless defending player controls an Island."
Serpent of the Endless Sea
Serpent of the Endless Sea 86%
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"This creature can't attack unless defending player controls an Island."
Sealock Monster
Sealock Monster 86%
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"This creature can't attack unless defending player controls an Island."