Bog Serpent 
Creature — Serpent
$0.10 #30513 0.00 19.6 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%
$0.17↑#266830.25↑31.3 years↑
"This creature can't attack unless defending player controls a Forest."
+1 more matching line
Barbarian Outcast96%
$0.09↓#310130.53↑24.6 years↑
"When you control no Swamps, sacrifice this creature."
Goblin Rock Sled92%
$0.07↓#308970.19↑32.1 years↑
"This creature can't attack unless defending player controls a Mountain."
Sea Serpent92%
$0.09↓#288030.24↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Manta Ray92%
$0.13↑#247400.0729.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ronom Serpent92%
$0.09↓#278550.53↑20.1 years
"This creature can't attack unless defending player controls a snow land."
+1 more matching line
Slipstream Serpent92%
$0.04↓#290800.17↑19.9 years
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Dandân91%
$1.96↑#21507↑0.12↑32.7 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Vodalian Knights90%
$1.01↑#296140.24↑31.8 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Armored Galleon90%
$1.07↑#299210.52↑28.2 years↑
"This creature can't attack unless defending player controls an Island."
Steam Frigate90%
$0.24↑#306720.0628.2 years↑
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent90%
$0.35↑#304020.0029.3 years↑
"This creature can't attack unless defending player controls an Island."
Sea Monster90%
$0.03↓#285350.25↑28.9 years↑
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada90%
$11.26↑#309860.40↑27.3 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark90%
$0.17↑#250780.0728.5 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship90%
$1.97↑#302050.0027.3 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander90%
$150.00↑#294540.27↑27.3 years↑
"this card can't attack unless defending player controls an Island."
Pirate Ship90%
$0.50↑#21668↑0.48↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Ethereal Whiskergill90%
$0.11↑#307320.0018.9 years
"This creature can't attack unless defending player controls an Island."
Merchant Ship90%
$43.78↑#285440.42↑32.7 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line