"Fourth Edition", +"poison counter", +!"for each poison counter", +!poisonous, +!infect, +!poisoned (2)
Whenever Marsh Viper deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)
Whenever Pit Scorpion deals damage to a player, that player gets a poison counter. <I>(A player with ten or more poison counters loses the game.)</I>
Gatherer works better in the Companion app!