Rot Wolf is a common Creature — Phyrexian Wolf card from Mirrodin Besieged (MBS), collector number 90. Current market price: $0.21 (foil $1.89), 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.) Whenever a creature dealt damage by Rot Wolf this turn dies, you may draw a card.