Card Text:
If there are any depletion counters on Timberline Ridge, it does not untap during your untap phase. At the beginning of your upkeep, remove a depletion counter from Timberline Ridge.
ocT: Add oR to your mana pool. Put a depletion counter on Timberline Ridge.
ocT: Add oG to your mana pool. Put a depletion counter on Timberline Ridge.