Harbinger of Night 
Creature — Spirit
$24.09 #14367 1.29 30.0 years
At the beginning of your upkeep, put a -1/-1 counter on each creature.
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Soul Snuffers96%
$0.26↓#4957↑0.56↓18.2 years↓
"When this creature enters, put a -1/-1 counter on each creature."
Darkness Descends94%
$0.26↓#10057↑0.37↓0.7 years↓
"Put two -1/-1 counters on each creature."
Midnight Banshee92%
$0.22↓#4679↑0.61↓18.5 years↓
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
Lockjaw Snapper86%
$1.54↓#161400.18↓18.5 years↓
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Choking Fumes86%
$0.13↓#25942↓0.00↓15.7 years↓
"Put a -1/-1 counter on each attacking creature."
Torture85%
$0.09↓#24150↓0.18↓31.1 years↑
"
: Put a -1/-1 counter on enchanted creature."
: Put a -1/-1 counter on enchanted creature."
Hazardous Conditions84%
$0.06↓#28996↓0.40↓10.1 years↓
"Creatures with no counters on them get -2/-2 until end of turn."
Planar Despair84%
$0.18↓#29871↓0.22↓25.4 years↓
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Gnarled Effigy84%
$0.15↓#27769↓0.07↓18.5 years↓
"
, 
: Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Nausea84%
$0.03↓#18163↓0.06↓28.3 years↓
"All creatures get -1/-1 until end of turn."
Shrivel84%
$0.10↓#18854↓0.07↓16.5 years↓
"All creatures get -1/-1 until end of turn."
Infest84%
$0.10↓#21931↓0.07↓24.0 years↓
"All creatures get -2/-2 until end of turn."
Languish84%
$0.35↓#5753↑0.26↓11.3 years↓
"All creatures get -4/-4 until end of turn."
Skinrender84%
$0.23↓#5692↑0.69↓16.1 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Cultbrand Cinder84%
$0.11↓#30659↓0.00↓18.5 years↓
"When this creature enters, put a -1/-1 counter on target creature."
Night of Souls' Betrayal82%
$2.01↓#10844↑0.60↓22.1 years↓
"All creatures get -1/-1."
Kaervek, the Spiteful82%
$0.29↓#10369↑0.58↓6.3 years↓
"Other creatures get -1/-1."
Blight Grenade82%
$0.39↓#125330.32↓4.0 years↓
"All creatures get -3/-3 until end of turn."
Black Sun's Zenith82%
$0.36↓#1937↑0.48↓15.7 years↓
"Put X -1/-1 counters on each creature. Shuffle this card into its owner's library."
Blight Rot82%
$0.28↓#8917↑0.04↓0.7 years↓
"Put four -1/-1 counters on target creature."