Stench of Decay 
Instant
$0.11 #29823 0.07 30.2 years
Nonartifact creatures get -1/-1 until end of turn.
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The Flesh Is Weak86%
$0.37↑#15535↑0.33↑3.9 years↓
"Nonartifact creatures get -1/-1."
Infest84%
$0.13↑#21635↑0.0523.9 years↓
"All creatures get -2/-2 until end of turn."
Nausea84%
$0.03↓#17556↑0.0028.2 years↓
"All creatures get -1/-1 until end of turn."
Shrivel84%
$0.10↓#18243↑0.24↑16.4 years↓
"All creatures get -1/-1 until end of turn."
Languish84%
$0.34↑#5680↑0.19↑11.1 years↓
"All creatures get -4/-4 until end of turn."
Blight Grenade84%
$0.38↑#12213↑0.053.9 years↓
"All creatures get -3/-3 until end of turn."
Hazardous Conditions84%
$0.05↓#287180.38↑9.9 years↓
"Creatures with no counters on them get -2/-2 until end of turn."
Planar Despair83%
$0.16↑#294230.1225.3 years↓
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Kaervek, the Spiteful82%
$0.28↑#9999↑0.38↑6.2 years↓
"Other creatures get -1/-1."
Night of Souls' Betrayal82%
$2.02↑#10440↑0.91↑21.9 years↓
"All creatures get -1/-1."
Toxic Deluge82%
$4.49↑#67↑0.87↑12.8 years↓
"All creatures get -X/-X until end of turn."
Mephitic Vapors80%
$0.11#20591↑0.36↑7.9 years↓
"All creatures get -1/-1 until end of turn."
Festergloom78%
$0.06↓#22598↑0.29↑12.1 years↓
"Nonblack creatures get -1/-1 until end of turn."
Rollick of Abandon78%
$0.04↓#296990.29↑12.3 years↓
"All creatures get +2/-2 until end of turn."
Cower in Fear78%
$0.14↑#15508↑0.1614.1 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Make Obsolete78%
$0.12↑#15167↑0.129.9 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Harvester of Misery78%
$1.77↑#14448↑0.38↑2.4 years↓
"When this creature enters, other creatures get -2/-2 until end of turn."
Holy Light78%
$2.43↑#293270.29↑32.1 years↑
"Nonwhite creatures get -1/-1 until end of turn."
Hideous Laughter77%
$0.20↑#252020.30↑21.9 years↓
"All creatures get -2/-2 until end of turn."
Shefet Archfiend77%
$0.23↑#16065↑0.161.6 years↓
"When this creature enters, all other creatures get -2/-2 until end of turn."