Kaervek, the Spiteful 
Legendary Creature — Human Warlock
$0.28 #9999 0.38 6.2 years
Other creatures get -1/-1.
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Night of Souls' Betrayal100%
$2.02↑#104400.91↑21.9 years↑
"All creatures get -1/-1."
Nausea97%
$0.03↓#17556↓0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel97%
$0.10↓#18243↓0.24↓16.4 years↑
"All creatures get -1/-1 until end of turn."
Infest97%
$0.13↓#21635↓0.05↓23.9 years↑
"All creatures get -2/-2 until end of turn."
Languish97%
$0.34↑#5680↑0.19↓11.1 years↑
"All creatures get -4/-4 until end of turn."
Toxic Deluge95%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
Hideous Laughter92%
$0.20↓#25202↓0.3021.9 years↑
"All creatures get -2/-2 until end of turn."
Blight Grenade90%
$0.38↑#12213↓0.05↓3.9 years↓
"All creatures get -3/-3 until end of turn."
Final Revels90%
$0.16↓#31154↓0.06↓18.9 years↑
"• All creatures get -0/-2 until end of turn."
Planar Despair90%
$0.16↓#29423↓0.12↓25.3 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Flowstone Slide90%
$0.15↓#27736↓0.2926.6 years↑
"All creatures get +X/-X until end of turn."
Drag to the Bottom90%
$0.06↓#21276↓0.07↓4.0 years↓
"Each creature gets -X/-X until end of turn, where X is 1 plus the number of basic land types among lands you control."
Hazardous Conditions88%
$0.05↓#28718↓0.389.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Withering Curse88%
$1.38↑#105340.00↓0.4 years↓
"All creatures get -2/-2 until end of turn."
Stronghold Taskmaster88%
$0.23↓#29060↓0.00↓28.5 years↑
"Other black creatures get -1/-1."
Urborg Shambler88%
$0.32↑#29571↓0.22↓25.9 years↑
"Other black creatures get -1/-1."
Dread of Night87%
$0.39↑#26533↓0.24↓28.9 years↑
"White creatures get -1/-1."
Mephitic Vapors86%
$0.11↓#20591↓0.367.9 years↑
"All creatures get -1/-1 until end of turn."
Biting Rain85%
$0.12↓#15523↓0.3810.4 years↑
"All creatures get -2/-2 until end of turn."
Darkness Descends85%
$0.27↓#104020.00↓0.6 years↓
"Put two -1/-1 counters on each creature."