
Slaughter Singer | Creature | Phyrexian Cleric | Toxic 2 (Players dealt combat damage by this creature also get two poison counters.)
Whenever another creature you control with toxic attacks, it gets +1/+1 until end of turn. | Adam Burn
4.0 LSV

Tainted Observer | Creature | Phyrexian Bird | Flying
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
Whenever another creature enters the battlefield under your control, you may pay {2}. If you do, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) | Johann Bodin
3.5 LSV

Necrogen Rotpriest | Creature | Phyrexian Zombie Cleric | Toxic 2 (Players dealt combat damage by this creature also get two poison counters.)
Whenever a creature you control with toxic deals combat damage to a player, that player gets an additional poison counter.
{1}{B}{G}: Target creature you control with toxic gains deathtouch until end of turn. | Igor Krstic
3.5 LSV

Cinderslash Ravager | Creature | Phyrexian Warrior | This spell costs {1} less to cast for each permanent you control with oil counters on it.
Vigilance
When Cinderslash Ravager enters the battlefield, it deals 1 damage to each creature your opponents control. | Wisnu Tan
3.5 LSV