Phyresis Outbreak 
Sorcery
$11.54 #3738 0.73 3.6 years
Each opponent gets a poison counter. Then each creature your opponents control gets -1/-1 until end of turn for each poison counter its controller has.
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Prologue to Phyresis82%
$0.57↓#2648↑0.56↓3.6 years
"Each opponent gets a poison counter."
Cower in Fear81%
$0.14↓#15508↓0.16↓14.1 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Make Obsolete81%
$0.12↓#15167↓0.12↓9.9 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Virulent Wound78%
$0.19↓#14073↓0.53↓15.6 years↑
"Put a -1/-1 counter on target creature. When that creature dies this turn, its controller gets a poison counter."
Arms of Hadar78%
$0.44↓#20205↓0.40↓4.2 years
"Creatures target player controls get -2/-2 until end of turn."
Suffocating Fumes76%
$0.20↓#14895↓0.43↓6.4 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Foundry Hornet76%
$0.25↓#25395↓0.33↓9.6 years↑
"When this creature enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn."
Hazardous Conditions76%
$0.05↓#28718↓0.38↓9.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Shrouded Shepherd // Cleave Shadows74%
$0.19↓#23328↓0.00↓3.0 years
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly74%
$0.12↓#14322↓0.21↓1.8 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Gruesome Realization72%
$0.23↓#10254↓0.00↓3.8 years
"• Creatures your opponents control get -1/-1 until end of turn."
Plague Mare72%
$0.29↓#15489↓0.37↓8.1 years↑
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Gnashing of Teeth72%
$0.18↓#21600↓0.00↓0.1 years↓
"• Creatures target player controls get -1/-1 until end of turn."
Mycosynth Fiend72%
$0.14↓#18973↓0.14↓15.3 years↑
"This creature gets +1/+1 for each poison counter your opponents have."
Wail of War72%
$0.15↓#14377↓0.21↓1.4 years↓
"• Creatures target opponent controls get -1/-1 until end of turn."
Night Clubber72%
$0.22↓#13720↓0.754.4 years
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Vraska's Fall72%
$0.39↓#2338↑0.49↓3.6 years
"Each opponent sacrifices a creature or planeswalker of their choice and gets a poison counter."
Minister of Pain71%
$0.13↓#26067↓0.07↓11.4 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Curse of Death's Hold71%
$0.92↓#9111↓0.51↓14.9 years↑
"Creatures enchanted player controls get -1/-1."
Norn's Decree71%
$8.42↓#41160.693.6 years
"Whenever one or more creatures an opponent controls deal combat damage to you, that opponent gets a poison counter."