Vodalian Knights 
Creature — Merfolk Knight
$1.01 #29928 0.07 32.0 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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Dandân96%
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"When you control no Islands, sacrifice this creature."
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Pirate Ship96%
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"When you control no Islands, sacrifice this creature."
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Sea Monster96%
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"This creature can't attack unless defending player controls an Island."
Wu Warship96%
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"This creature can't attack unless defending player controls an Island."
Steam Frigate96%
$0.25↓#310150.61↑28.3 years↓
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada96%
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"This creature can't attack unless defending player controls an Island."
Hammerhead Shark96%
$0.17↓#253920.0028.6 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent96%
$0.39↓#306500.31↑29.5 years↓
"This creature can't attack unless defending player controls an Island."
Armored Galleon96%
$1.07↑#300620.0028.3 years↓
"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."
Zhou Yu, Chief Commander96%
$150.00↑#297150.26↑27.5 years↓
"this card can't attack unless defending player controls an Island."
Merchant Ship95%
$42.56↑#287710.1232.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Island Fish Jasconius94%
$0.32↓#269030.0032.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark94%
$0.31↓#260070.0032.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Kukemssa Serpent92%
$0.11↓#289480.0030.0 years↓
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Serpent92%
$0.20↓#303950.25↑26.0 years↓
"This creature can't attack unless defending player controls an Island."
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"This creature can't attack unless defending player controls an Island."