Keldyr, Master of the true art

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)
Other creatures have undying
Whenever a creature would enter the battlefield
from the graveyard under an opponents control,
put it onto the battlefield under your
control instead.