Ravacin, Mountain's Bane

Ravacin, Mountain's Bane doesn't untap during your untap step.
{ut}: Put an age counter on Ravacin, Mountain's Bane.
If Ravacin, Mountain's Bane has age counters on it equal to or greater than the number of +1/+1 counters on it, transform it. Remove all counters from Ravacin, Mountain's Bane.