Kukemssa Serpent 
Creature — Serpent
$0.11 #28620 0.47 29.9 years
This creature can't attack unless defending player controls an Island.
, Sacrifice an Island: Target land an opponent controls becomes an Island until end of turn.When you control no Islands, sacrifice this creature.
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Cards similar to Kukemssa 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.
Dreamwinder98%
$0.10↓#299500.35↓24.9 years↓
", Sacrifice an Island: Target land becomes an Island until end of turn."
, Sacrifice an Island: Target land becomes an Island until end of turn."+1 more matching line
Manta Ray96%
$0.13↑#247400.07↓29.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Sea Serpent96%
$0.09↓#288030.24↓33.1 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Serpent96%
$0.04↓#290800.17↓19.9 years↓
"When you control no Islands, sacrifice this creature."
+1 more matching line
Dandân94%
$1.96↑#21507↑0.12↓32.7 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Skeleton Ship93%
$6.19↑#20643↑0.00↓31.3 years↑
"When you control no Islands, sacrifice this card."
Pirate Ship92%
$0.50↑#21668↑0.4833.1 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Knights92%
$1.01↑#296140.24↓31.8 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Armored Galleon91%
$1.07↑#299210.5228.2 years↓
"This creature can't attack unless defending player controls an Island."
Steam Frigate91%
$0.24↑#306720.06↓28.2 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent91%
$0.35↑#304020.00↓29.3 years
"This creature can't attack unless defending player controls an Island."
Sea Monster91%
$0.03↓#285350.25↓28.9 years↓
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada91%
$11.26↑#309860.4027.3 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark91%
$0.17↑#250780.07↓28.5 years↓
"This creature can't attack unless defending player controls an Island."
Wu Warship91%
$1.97↑#302050.00↓27.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander91%
$150.00↑#294540.27↓27.3 years↓
"this card can't attack unless defending player controls an Island."
Merchant Ship90%
$43.78↑#285440.4232.7 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Ethereal Whiskergill90%
$0.11#307320.00↓18.9 years↓
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius90%
$0.32↑#265710.4232.7 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark89%
$0.29↑#256310.30↓32.1 years↑
"When you control no Islands, sacrifice this creature."
+1 more matching line