Plague Nurse is a common Creature — Phyrexian Cleric card from Phyrexia: All Will Be One (ONE), collector number 179. Current market price: $0.21 (foil $0.25), TCGplayer market prices via Scryfall.
Toxic 2 {2}{G}: Each other creature you control with toxic gains toxic 1 until end of turn. Activate only once each turn. (A player dealt combat damage by a creature with toxic also gets poison counters equal to that creature's total toxic value.)