Slipstream Serpent 
Creature — Serpent
$0.04 #29080 0.17 19.9 years
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
Morph 
(You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
(You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)Click a line or tag to filter
Cards similar to Slipstream 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.
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"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent97%
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"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."
Hammerhead Shark97%
$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 Commander97%
$150.00↑#294540.27↑27.3 years↑
"this card can't attack unless defending player controls an Island."
Pirate Ship96%
$0.50↑#21668↑0.48↑33.1 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Island Fish Jasconius96%
$0.32↑#265710.42↑32.7 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Merchant Ship96%
$43.78↑#285440.42↑32.7 years↑
"When you control no Islands, sacrifice this creature."
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Ethereal Whiskergill96%
$0.11↑#307320.00↓18.9 years↓
"This creature can't attack unless defending player controls an Island."
Giant Shark96%
$0.29↑#256310.30↑32.1 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Eel96%
$0.06↑#260520.2123.9 years↑
"This creature can't attack unless defending player controls an Island."
Kukemssa Serpent96%
$0.11↑#286200.47↑29.9 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Serpent96%
$0.19↑#301440.00↓25.9 years↑
"This creature can't attack unless defending player controls an Island."