Satyr of Prolonged Darkness

Undying (When this creature dies, if it had no
+1/+1 counters on it, return it to the battlefield under
its owner's control with a +1/+1 counter on it.)
As long as your devotion to black is more than
10, Satyr of Prolonged Darkness gets +7+7 and
gains indestructible. (Each {b} in the mana costs
of permanents you control counts toward your
devotion to black.)