Phyrexian Vatmother is a rare Creature — Phyrexian Horror card from Mirrodin Besieged (MBS), collector number 52. Current market price: $0.41 (foil $1.82), TCGplayer market prices via Scryfall.
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) At the beginning of your upkeep, you get a poison counter.