Rosen, the Beloved

Undying (When this permanent is put into a graveyard from the battlefield, if it had no +1/+1 counters on it, return it to the battlefield under its owners control with a +1/+1 counter on it.)
{u/b}{u/b}: Put a +1/+1 counter on Rosen if a creature died this turn.
Unearth {1}{b}