Marsh Lurker 

Creature — Beast
$0.09 #32141 0.00 29.0 years
Sacrifice a Swamp: This creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)
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Cards similar to Marsh Lurker 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.
Mire Shade80%
$0.10↑#319730.0030.0 years↑
"
, Sacrifice a Swamp: Put a +1/+1 counter on this creature. Activate only as a sorcery."
Coffin Puppets80%
$0.19↑#307790.0026.4 years↓
"Sacrifice two lands: Return this card from your graveyard to the battlefield. Activate only during your upkeep and only if you control a Swamp."
Mold Demon74%
$17.95↑#316430.11↑32.4 years↑
"When this creature enters, sacrifice it unless you sacrifice two Swamps."
Akki Avalanchers73%
$0.07↓#275100.0522.1 years↓
"Sacrifice a land: This creature gets +2/+0 until end of turn. Activate only once each turn."
Coastal Hornclaw72%
$0.05↓#314350.0026.4 years↓
"Sacrifice a land: This creature gains flying until end of turn."
Blighted Shaman72%
$0.20↑#286860.0030.0 years↑
"
, Sacrifice a Swamp: Target creature gets +1/+1 until end of turn."
Trenching Steed70%
$0.15↑#276590.0026.4 years↓
"Sacrifice a land: This creature gets +0/+3 until end of turn."