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.
Unstable Mutation
{U}
Enchantment -- Aura
Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.