Mephitic Vapors 
Sorcery
$0.11 #21206 0.00 8.0 years
All creatures get -1/-1 until end of turn.
Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
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Cards similar to Mephitic Vapors 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.
Deadly Visit94%
$0.05↓#241180.008.0 years
"Surveil 2."
Sterling Hound92%
$0.15↑#176440.12↑2.5 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids92%
$0.15↑#190590.20↑0.3 years↓
"When this creature enters, surveil 2."
Imperious Inkmage92%
$0.06↓#251610.13↑0.5 years↓
"When this creature enters, surveil 2."
Dimir Informant92%
$0.15↑#245340.008.0 years
"When this creature enters, surveil 2."
Watcher in the Mist92%
$0.05↓#28287↓0.008.0 years
"When this creature enters, surveil 2."
Wreckage Wickerfolk92%
$0.16↑#14137↑0.001.7 years↓
"When this creature enters, surveil 2."
Whisper Agent92%
$0.09↓#242230.068.0 years
"When this creature enters, surveil 1."
Sanitation Automaton92%
$0.08↓#225720.002.7 years↓
"When this creature enters, surveil 1."
Muse's Encouragement92%
$0.09↓#229400.020.5 years↓
"Surveil 2."
Consider92%
$0.30↑#360↑0.085.1 years↓
"Surveil 1."
Shore Lurker92%
$0.08↓#244280.070.7 years↓
"When this creature enters, surveil 1."
Wild Hypothesis90%
$0.17↑#15972↑0.010.5 years↓
"Surveil 2."
Barrier of Bones90%
$0.10↓#15296↑0.068.0 years
"When this creature enters, surveil 1."
Nausea90%
$0.03↓#181630.0628.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel90%
$0.10↓#188540.0716.5 years↑
"All creatures get -1/-1 until end of turn."
Infest90%
$0.10↓#219310.0724.0 years↑
"All creatures get -2/-2 until end of turn."
Languish90%
$0.35↑#5753↑0.26↑11.3 years↑
"All creatures get -4/-4 until end of turn."
Unexplained Disappearance90%
$0.21↑#173510.38↑8.0 years
"Surveil 1."
Blight Grenade89%
$0.39↑#12533↑0.32↑4.0 years↓
"All creatures get -3/-3 until end of turn."