Black Serpent

Deathtouch At the beginning of each upkeep, Black Serpent deals 1 damage to each opponent who has a toxin counter. Then, each of those players loses 1 toxin counter. Whenever Black Serpent deals combat damage to a player, that player gets 3 toxin counters. {T}{B}{B}{B}: Each opponent gets 3 toxin counters. Activate only as a sorcery.