Harbinger of Night 
Creature — Spirit
$28.20 #14222 0.50 29.9 years
At the beginning of your upkeep, put a -1/-1 counter on each creature.
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Darkness Descends96%
$0.27↓#10402↑0.00↓0.6 years↓
"Put two -1/-1 counters on each creature."
Soul Snuffers96%
$0.27↓#5038↑0.21↓18.1 years↓
"When this creature enters, put a -1/-1 counter on each creature."
Midnight Banshee92%
$0.24↓#4694↑0.4018.3 years↓
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
Lockjaw Snapper86%
$1.11↓#158390.29↓18.3 years↓
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Choking Fumes86%
$0.08↓#25749↓0.69↑15.6 years↓
"Put a -1/-1 counter on each attacking creature."
Torture85%
$0.09↓#23874↓0.4730.9 years↑
"
: Put a -1/-1 counter on enchanted creature."
: Put a -1/-1 counter on enchanted creature."
Hazardous Conditions84%
$0.05↓#28718↓0.38↓9.9 years↓
"Creatures with no counters on them get -2/-2 until end of turn."
Planar Despair84%
$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."
Gnarled Effigy84%
$0.18↓#27488↓0.24↓18.3 years↓
"
, 
: Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Nausea84%
$0.03↓#17556↓0.00↓28.2 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."
Infest84%
$0.13↓#21635↓0.05↓23.9 years↓
"All creatures get -2/-2 until end of turn."
Languish84%
$0.34↓#5680↑0.19↓11.1 years↓
"All creatures get -4/-4 until end of turn."
Skinrender84%
$0.17↓#5738↑0.4015.9 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Cultbrand Cinder84%
$0.11↓#30299↓0.00↓18.3 years↓
"When this creature enters, put a -1/-1 counter on target creature."
Night of Souls' Betrayal82%
$2.02↓#10440↑0.91↑21.9 years↓
"All creatures get -1/-1."
Kaervek, the Spiteful82%
$0.28↓#9999↑0.38↓6.2 years↓
"Other creatures get -1/-1."
Blight Grenade82%
$0.38↓#122130.05↓3.9 years↓
"All creatures get -3/-3 until end of turn."
Black Sun's Zenith82%
$0.35↓#1936↑0.39↓15.6 years↓
"Put X -1/-1 counters on each creature. Shuffle this card into its owner's library."
Blight Rot82%
$0.25↓#9217↑0.00↓0.6 years↓
"Put four -1/-1 counters on target creature."