Rhaine, Kin-Root Spirit

Whenever a creature you control is dealt damage, Bolster 1. (Choose a creature with the least toughness
among creatures you control and put a +1/+1 counter
on it.)
Whenever a +1/+1 counter is placed on a
creature you control, gain 1 life.

Rhaine lived to protect the innocent, died to protect the innocent, and hasn't since stopped.