Blight Mamba

Mana cost: {1}{G}
Type: Creature — Phyrexian Snake
Power / toughness: 1 / 1
Set: Phyrexia: All Will Be One Commander #105 (common)
Price: $0.39 USD

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.

Blight Mamba has 3 printings, first in Scars of Mirrodin (2010). EDHREC ranks it #8,074 among Commander cards. It appears most in Fynn, the Fangbearer decks (2,582 on EDHREC). 1 public deck on TCG runs it. It has 6 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Blight Mamba

Corrupting Influence - Phyrexia: All Will Be One Commander, led by Ixhel, Scion of Atraxa

Commanders that run Blight Mamba most

Deck counts from EDHREC.

Often played with Blight Mamba

Cards that show up in the same decks on EDHREC.

Rulings

2011-01-01: If damage from a source with infect that would be dealt to a player is prevented, that player doesn't get poison counters. If damage from a source with infect that would be dealt to a creature is prevented, that creature doesn't get -1/-1 counters.
2011-01-01: The -1/-1 counters remain on the creature indefinitely. They're not removed if the creature regenerates or the turn ends.
2011-01-01: Infect's effect applies to any damage, not just combat damage.
2011-01-01: A player who has ten or more poison counters loses the game. This is a state-based action.
2011-01-01: Damage from a source with infect is damage in all respects. If the source with infect also has lifelink, damage dealt by that source also causes its controller to gain that much life. Damage from a source with infect can be prevented or redirected. Abilities that trigger on damage being dealt will trigger if a source with infect deals damage, if appropriate.
2011-01-01: Damage from a source with infect affects planeswalkers normally.