Hellkite Peak

Hellkite Peak enters the battlefield tapped.
At the beginning of your end step, if you
control four or more Mountains and
Hellkite Peak isn't a creature, you may
put three +1/+1 counters on it. If you do
it becomes a 0/0 red Dragon creature
with defender and flying. It's still a land.
Mounds, reasonably safe. Hills, probably fine. Cliffs, begin to worry me. Don't go near a summit!