Delvefall
Mephitic Vapors

Mephitic Vapors {2}{B}

Sorcery

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 that do something similar expected a card that isn't here?

Nausea
Nausea 100%
$0.13#16607
"All creatures get -1/-1 until end of turn."
Shrivel
Shrivel 100%
$0.09#17326
"All creatures get -1/-1 until end of turn."
Hell Swarm
Hell Swarm 100%
$0.46#31131
"All creatures get -1/-0 until end of turn."
Toxic Deluge
Toxic Deluge 99%
$3.21#67
"All creatures get -X/-X until end of turn."
Glistening Deluge
Glistening Deluge 97%
$0.26#20465
"All creatures get -1/-1 until end of turn. Creatures that are green and/or white get an additional -2/-2 until end of turn."
Marsh Gas
Marsh Gas 97%
$0.07#29307
"All creatures get -2/-0 until end of turn."
Infest
Infest 96%
$0.20#21161
"All creatures get -2/-2 until end of turn."
Biting Rain
Biting Rain 96%
$0.13#15194
"All creatures get -2/-2 until end of turn."
Withering Curse
Withering Curse 96%
$1.51#11564
"All creatures get -2/-2 until end of turn."
Massacre
Massacre 96%
$1.86#11190
"All creatures get -2/-2 until end of turn."
Rags // Riches
Rags // Riches 96%
$0.28#14534
"All creatures get -2/-2 until end of turn."
Rising Miasma
Rising Miasma 96%
$0.05#27963
"All creatures get -2/-2 until end of turn."
Choking Miasma
Choking Miasma 96%
$0.08#24812
"All creatures get -2/-2 until end of turn."
Hideous Laughter
Hideous Laughter 96%
$0.19#24967
"All creatures get -2/-2 until end of turn."
Deluge of Doom
Deluge of Doom 96%
$0.26#10019
"All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard."
Languish
Languish 96%
$0.38#5657
"All creatures get -4/-4 until end of turn."
Feast of Succession
Feast of Succession 95%
$0.26#14588
"All creatures get -4/-4 until end of turn. You become the monarch."
Cloudkill
Cloudkill 94%
$0.22#15689
"All creatures get -X/-X until end of turn, where X is the greatest mana value of a commander you own on the battlefield or in the command zone."
Terror Tide
Terror Tide 94%
$0.28#6464
"All creatures get -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Golden Demise
Golden Demise 94%
$0.25#17569
"All creatures get -2/-2 until end of turn. If you have the city's blessing, instead only creatures your opponents control get -2/-2 until end of turn."