Marsh Lurker 

Creature — Beast
$0.10 #31882 0.10 28.9 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#316370.21↑29.9 years↑
"
, Sacrifice a Swamp: Put a +1/+1 counter on this creature. Activate only as a sorcery."
Coffin Puppets80%
$0.16↑#305320.30↑26.3 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 Demon76%
$17.78↑#313700.00↓32.3 years↑
"When this creature enters, sacrifice it unless you sacrifice two Swamps."
Akki Avalanchers72%
$0.08↓#272200.1721.9 years↓
"Sacrifice a land: This creature gets +2/+0 until end of turn. Activate only once each turn."
Blighted Shaman72%
$0.19↑#283880.47↑29.9 years↑
"
, Sacrifice a Swamp: Target creature gets +1/+1 until end of turn."
Coastal Hornclaw72%
$0.05↓#311060.1726.3 years↓
"Sacrifice a land: This creature gains flying until end of turn."
Fen Stalker70%
$0.09↓#317030.00↓26.3 years↓
"This creature has fear as long as you control no untapped lands."
Trenching Steed70%
$0.16↑#272980.29↑26.3 years↓
"Sacrifice a land: This creature gets +0/+3 until end of turn."