Creature - Snake 3/3, 3B (4) Whenever Crypt Cobra attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)1
Illus. Ron Spencer
The player gets a poison counter as a triggered ability on not blocking the Cobra. Killing the Cobra after declaring blockers or preventing its damage will not prevent the poison counter. [D'Angelo 1999/07/01]