Vodalian Knights 
Creature — Merfolk Knight
$1.01 #29614 0.24 31.8 years
First strike
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
: This creature gains flying until end of turn.Click a line or tag to filter
Cards similar to Vodalian Knights 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.
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"When you control no Islands, sacrifice this creature."
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"When you control no Islands, sacrifice this creature."
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"When you control no Islands, sacrifice this creature."
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Armored Galleon96%
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"This creature can't attack unless defending player controls an Island."
Steam Frigate96%
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"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent96%
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"This creature can't attack unless defending player controls an Island."
Ethereal Whiskergill96%
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"This creature can't attack unless defending player controls an Island."
Sea Monster96%
$0.03↓#285350.2528.9 years↓
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada96%
$11.26↑#309860.40↑27.3 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark96%
$0.17↓#250780.07↓28.5 years↓
"This creature can't attack unless defending player controls an Island."
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$1.97↑#302050.00↓27.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander96%
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"this card can't attack unless defending player controls an Island."
Merchant Ship95%
$43.78↑#285440.42↑32.7 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Island Fish Jasconius94%
$0.32↓#265710.42↑32.7 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark93%
$0.29↓#256310.3032.1 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Serpent92%
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"This creature can't attack unless defending player controls an Island."
Kukemssa Serpent92%
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"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Eel92%
$0.06↓#260520.2123.9 years↓
"This creature can't attack unless defending player controls an Island."