Blight Mamba is a common Creature — Phyrexian Snake card from Scars of Mirrodin (SOM), collector number 112. Current market price: $0.39 (foil $4.54), 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.) {1}{G}: Regenerate this creature.