Primordial Rhino

Trample
Each time another Rhino comes into play Primordial Rhino get's +1/+1.
When Primordial Rhino has four or more
+1/+1 counters on it it becomes indestructible.
When Primordial Rhino enters the battlefield pay {4} more mana instead
to bring it in with a +4/+4 counter.