Phyresis Outbreak 
Sorcery
$12.33 #3749 0.69 3.7 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%
$0.81↓#2662↑0.55↓3.7 years
"Each opponent gets a poison counter."
Make Obsolete79%
$0.14↓#15749↓0.22↓10.1 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Cower in Fear79%
$0.15↓#16060↓0.05↓14.3 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Virulent Wound78%
$0.25↓#14116↓0.28↓15.7 years↑
"Put a -1/-1 counter on target creature. When that creature dies this turn, its controller gets a poison counter."
Arms of Hadar78%
$0.53↓#20694↓0.25↓4.4 years
"Creatures target player controls get -2/-2 until end of turn."
Foundry Hornet76%
$0.21↓#25736↓0.06↓9.7 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."
Suffocating Fumes75%
$0.20↓#15331↓0.06↓6.5 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Hazardous Conditions75%
$0.06↓#28996↓0.40↓10.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Shrouded Shepherd // Cleave Shadows74%
$0.18↓#23763↓0.00↓3.1 years
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly74%
$0.12↓#14351↓0.28↓1.9 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Gruesome Realization72%
$0.17↓#10711↓0.06↓3.9 years
"• Creatures your opponents control get -1/-1 until end of turn."
Gnashing of Teeth72%
$0.14↓#18884↓0.19↓0.2 years↓
"• Creatures target player controls get -1/-1 until end of turn."
Mycosynth Fiend72%
$0.14↓#19315↓0.33↓15.4 years↑
"This creature gets +1/+1 for each poison counter your opponents have."
Plague Mare72%
$0.28↓#16023↓0.13↓8.3 years↑
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Vraska's Fall72%
$0.34↓#2342↑0.49↓3.7 years
"Each opponent sacrifices a creature or planeswalker of their choice and gets a poison counter."
Norn's Decree72%
$8.23↓#42090.693.7 years
"Whenever one or more creatures an opponent controls deal combat damage to you, that opponent gets a poison counter."
Night Clubber71%
$0.28↓#14238↓0.20↓4.5 years
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Minister of Pain71%
$0.07↓#26587↓0.11↓11.6 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Elesh Norn, Grand Cenobite70%
$15.57↑#859↑1.78↑15.4 years↑
"Creatures your opponents control get -2/-2."
Wail of War70%
$0.19↓#14379↓0.14↓1.5 years↓
"• Creatures target opponent controls get -1/-1 until end of turn."