Ketra, Protector of the Meek

{w}{t} Create a 1/1 Rabbit creature token.
When a rabbit you control is dealt damage,
put a +1/+1 counter on Ketra, Protector of
the Meek. Then you may have Ketra deal
damage equal to her power to any target
that dealt damage or controlled a source that dealt damage to a rabbit this turn.