Phyrexian Beast

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Duskmourn: House of Horror Commander Tokens

Commander Masters Tokens

Phyrexia: All Will Be One Tokens

Commander Legends: Battle for Baldur's Gate Tokens

Viral Spawning

Create a 3/3 green Phyrexian Beast creature token with toxic 1. (Players dealt combat damage by it also get a poison counter.)
Corrupted — As long as an opponent has three or more poison counters and Viral Spawning is in your graveyard, it has flashback {2}{G}. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Lukka, Bound to Ruin

Compleated ({Red Green Mana for Phyrexian} can be paid with {R}, {G}, or 2 life. If life was paid, this planeswalker enters with two fewer loyalty counters.)
+1: Add {R}{G}. Spend this mana only to cast creature spells or activate abilities of creatures.
−1: Create a 3/3 green Phyrexian Beast creature token with toxic 1.
−4: Lukka deals X damage divided as you choose among any number of target creatures and/or planeswalkers, where X is the greatest power among creatures you controlled as you activated this ability.

Compleated ({R/G/P} can be paid with {R}, {G}, or 2 life. If life was paid, this planeswalker enters with two fewer loyalty counters.)
[+1]: Add {R}{G}. Spend this mana only to cast creature spells or activate abilities of creatures.
[−1]: Create a 3/3 green Phyrexian Beast creature token with toxic 1.
[−4]: Lukka deals X damage divided as you choose among any number of target creatures and/or planeswalkers, where X is the greatest power among creatures you control as you activate this ability.

Goliath Hatchery

When Goliath Hatchery enters the battlefield, create two 3/3 green Phyrexian Beast creature tokens with toxic 1. (Players dealt combat damage by them also get a poison counter.)
Corrupted — At the beginning of your upkeep, if an opponent has three or more poison counters, choose a creature you control, then draw cards equal to its total toxic value.

When Goliath Hatchery enters, create two 3/3 green Phyrexian Beast creature tokens with toxic 1. (Players dealt combat damage by them also get a poison counter.)
Corrupted — At the beginning of your upkeep, if an opponent has three or more poison counters, choose a creature you control, then draw cards equal to its total toxic value.

Poison Counter

(A player with ten or more poison counters loses the game.)