Stinging Warrior

When Stinging Warrior deals combat damage to
a creature, put a -0/-1 counter on that creature.
When Stinging Warrior deals combat damage to
a player, Stinging Warrior deals 3 damage to that
player. For each creature that player controls
that has one or more -0/-1 counters on it,
Stinging Warrior deals 3 damage to that creature.