Blighted Agent is a common Creature — Phyrexian Human Rogue card from New Phyrexia (NPH), collector number 29. Current market price: $1.45 (foil $10.09), 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.) This creature can't be blocked.