Creature — Snake 2/2, 2G (3)
Common
Whenever Sabertooth Cobra deals damage to a player, he or she gets a poison counter. That player gets another poison counter at the beginning of his or her next upkeep unless he or she pays {2} before that turn. (A player with ten or more poison counters loses the game.)
Illus. Andrew Robinson

10/4/2004: The ability still gives a poison counter even if Sabertooth Cobra leaves the battlefield before the next upkeep.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander