Unknown Event

Enchantment

Poison Tolerance +1 (It takes an additional poison counter for you to lose the game to poison.)
When Naturalize the Phyresis enters the battlefield, destroy target artifact or enchantment an opponent controls.

Naturalize the Phyresis

Poison Tolerance +1 (It takes an additional poison counter for you to lose the game to poison.)
When Long-Term Phyresis Study enters the battlefield, return up to one target creature card from your graveyard to your hand. Then, draw a card.

Long-Term Phyresis Study

Poison Tolerance +2 (It takes two additional poison counters for you to lose the game to poison.)
When Burn the Phyresis enters the battlefield, it deals 3 damage to any target.

Burn the Phyresis

Phyrexia: All Will Be One Commander

Phyresis Outbreak

Poison Counter

Sorcery

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.

Phyrexia: All Will Be One

Instant

Each opponent gets a poison counter.
Draw a card.

Prologue to Phyresis

The List

Enchantment — Aura

Enchant creature
Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Phyresis

Commander Anthology Volume II

Phyrexian Germ

Gain control of target Equipment, then create a 0/0 black Phyrexian Germ creature token and attach that Equipment to it.