Gregor Clegane, The Mountain

Trample
Gregor Clegane, The Mountain can't block.
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 The Mountain has a +1/+1 counter on it, it has indestructible.