Vodalian Serpent 
Creature — Serpent
$0.20 #30395 0.25 26.0 years
Kicker 
(You may pay an additional as you cast this spell.)
(You may pay an additional as you cast this spell.)This creature can't attack unless defending player controls an Island.
If this creature was kicked, it enters with four +1/+1 counters on it.
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Cards similar to Vodalian Serpent 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 Frigate98%
$0.25↑#310150.61↑28.3 years↑
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada98%
$10.74↑#312190.05↓27.5 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster98%
$0.05↓#288030.00↓29.0 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship98%
$1.97↑#304740.12↓27.5 years↑
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent98%
$0.39↑#306500.3129.5 years↑
"This creature can't attack unless defending player controls an Island."
Armored Galleon98%
$1.07↑#300620.00↓28.3 years↑
"This creature can't attack unless defending player controls an Island."
Ethereal Whiskergill98%
$0.25↑#310620.00↓19.0 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark98%
$0.17↓#253920.00↓28.6 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander98%
$150.00↑#297150.2627.5 years↑
"this card can't attack unless defending player controls an Island."
Slipstream Eel96%
$0.06↓#264140.05↓24.0 years↓
"This creature can't attack unless defending player controls an Island."
Sea Serpent96%
$0.10↓#290770.44↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
Manta Ray95%
$0.15↓#250540.00↓29.4 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Serpent94%
$0.04↓#293620.12↓20.0 years↓
"This creature can't attack unless defending player controls an Island."
Dandân93%
$1.34↑#21784↑0.3332.8 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Knights92%
$1.01↑#299280.07↓32.0 years↑
"This creature can't attack unless defending player controls an Island."
Goblin Rock Sled92%
$0.07↓#311640.00↓32.2 years↑
"This creature can't attack unless defending player controls a Mountain."
Merchant Ship90%
$42.56↑#287710.12↓32.8 years↑
"This creature can't attack unless defending player controls an Island."
Pirate Ship90%
$0.45↑#21999↑0.1633.2 years↑
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius90%
$0.32↑#269030.00↓32.8 years↑
"This creature can't attack unless defending player controls an Island."
Sealock Monster90%
$0.08↓#23116↑0.2013.1 years↓
"This creature can't attack unless defending player controls an Island."