Aries

Bestow {r}{r}{r} (If you cast this spell for its bestow
cost, it's an Aura spell with enchant creature. It
becomes a creature again if it's not attached to a
creature.)
Whenever Aries or enchanted creature deals
combat damage to a player, put that many +1/+1 counters on it.
Enchanted creature gets +3/+3.