Viridian Corrupter is a uncommon Creature — Phyrexian Elf Shaman card from Mirrodin Besieged (MBS), collector number 94. Current market price: $0.35 (foil $6.65), 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.) When this creature enters, destroy target artifact.