Dreamwinder 

Creature — Serpent
$0.07 #30252 0.06 25.1 years
This creature can't attack unless defending player controls an Island.
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Cards similar to Dreamwinder 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.
Kukemssa Serpent98%
$0.11↑#289480.0030.0 years↑
"
, Sacrifice an Island: Target land an opponent controls becomes an Island until end of turn."
+1 more matching line
Steam Frigate94%
$0.25↑#310150.61↑28.3 years↑
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada94%
$10.74↑#312190.0527.5 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster94%
$0.05↓#288030.0029.0 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship94%
$1.97↑#304740.1227.5 years↑
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent94%
$0.39↑#306500.31↑29.5 years↑
"This creature can't attack unless defending player controls an Island."
Armored Galleon94%
$1.07↑#300620.0028.3 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark94%
$0.17↑#253920.0028.6 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander94%
$150.00↑#297150.26↑27.5 years↑
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill93%
$0.25↑#310620.0019.0 years↓
"This creature can't attack unless defending player controls an Island."
Serpent of the Endless Sea90%
$0.29↑#22028↑0.24↑17.3 years↓
"This creature can't attack unless defending player controls an Island."
Slipstream Eel90%
$0.06↓#264140.0524.0 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent90%
$0.20↑#303950.25↑26.0 years
"This creature can't attack unless defending player controls an Island."
Goblin Rock Sled88%
$0.07#311640.0032.2 years↑
"This creature can't attack unless defending player controls a Mountain."
Floodchaser86%
$0.10↑#295200.0018.7 years↓
"
, Remove a +1/+1 counter from this creature: Target land becomes an Island until end of turn."
+1 more matching line
Harbor Serpent78%
$0.11↑#21036↑0.0016.3 years↓
"This creature can't attack unless there are five or more Islands on the battlefield."
Sealock Monster76%
$0.08↑#23116↑0.20↑13.1 years↓
"When this creature becomes monstrous, target land becomes an Island in addition to its other types."
+1 more matching line
Mystic Compass74%
$0.26↑#246110.1230.4 years↑
"
,
: Target land becomes the basic land type of your choice until end of turn."