Half-Pint Hero

Creatures you control with power 4 or greater have mentor (Whenever they attack, put a +1/+1 counter on target creature with lesser power.)
Whenever a +1/+1 counter is put on Half-Pint Hero, it deals 1 damage to any target.
"In the Boros legion, the strong teach the weak. Sometimes, though, the weak can teach the strong something."
- Aurelia, Boros Archangel.