Bog Serpent 
Creature — Serpent
$0.10 #30754 0.00 19.7 years
This creature can't attack unless defending player controls a Swamp.
When you control no Swamps, sacrifice this creature.
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Cards similar to Bog 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.
Gorilla Pack97%
$0.18↑#270320.0031.4 years↑
"This creature can't attack unless defending player controls a Forest."
+1 more matching line
Barbarian Outcast96%
$0.05↓#313880.0024.7 years↑
"When you control no Swamps, sacrifice this creature."
Goblin Rock Sled92%
$0.07↓#311640.0032.2 years↑
"This creature can't attack unless defending player controls a Mountain."
Manta Ray92%
$0.15↑#250540.0029.4 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Sea Serpent92%
$0.10#290770.44↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ronom Serpent92%
$0.08↓#280040.0020.2 years
"This creature can't attack unless defending player controls a snow land."
+1 more matching line
Slipstream Serpent92%
$0.04↓#293620.12↑20.0 years
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Dandân91%
$1.34↑#21784↑0.33↑32.8 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Deep-Sea Serpent90%
$0.39↑#306500.31↑29.5 years↑
"This creature can't attack unless defending player controls an Island."
Armored Galleon90%
$1.07↑#300620.0028.3 years↑
"This creature can't attack unless defending player controls an Island."
Steam Frigate90%
$0.25↑#310150.61↑28.3 years↑
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada90%
$10.74↑#312190.0527.5 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster90%
$0.05↓#288030.0029.0 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Knights90%
$1.01↑#299280.0732.0 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Wu Warship90%
$1.97↑#304740.12↑27.5 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark90%
$0.17↑#253920.0028.6 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander90%
$150.00↑#297150.26↑27.5 years↑
"this card can't attack unless defending player controls an Island."
Merchant Ship90%
$42.56↑#287710.12↑32.8 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ethereal Whiskergill90%
$0.25↑#310620.0019.0 years
"This creature can't attack unless defending player controls an Island."
Pirate Ship90%
$0.45↑#21999↑0.16↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line