Blight Mamba is a common Creature — Phyrexian Snake card from The List (PLST), collector number SOM-112. Current market price: $0.26, 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.