Phyresis Outbreak
Sorcery
Oracle Text
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.Rulings (1)
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Wizards of the CoastThe amount a creature's power and toughness are reduced is determined only once, at the time Phyresis Outbreak resolves. It won't change if that creature's controller later gets more poison counters or if another player takes control of it later in the same turn.