Hapatra, Vizier of Poisons
{B}{G}
Legendary Creature -- Human Cleric
2/2
Whenever ~this~ deals combat damage to a player, you may put a -1/-1 counter on target creature.
Whenever you put one or more -1/-1 counters on a creature, create a 1/1 green Snake creature token with deathtouch.
Obelisk Spider
{1}{B}{G}
Creature -- Spider
1/4
Reach
Whenever ~this~ deals combat damage to a creature, put a -1/-1 counter on that creature.
Whenever you put one or more -1/-1 counters on a creature, each opponent loses 1 life and you gain 1 life.