Shara Ishvalda, The Bound

Shara Ishvalda, The Bound enters the battlefield
with 5 boulder counters on him.
Shara Ishvalda, The Bound gets +1/+1 for every boulder counter on him.
When Shara Ishvalda, The Bound takes damage,
remove a boulder counter.
If Shara Ishvalda, The Bound would be
destroyed, regenerate it and remove all boulder counters from it.
If there are no boulder counters on Shara
Ishvalda, The Bound, transform it.