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. {T}: Add {R} to your mana pool. Put a depletion counter on Timberline Ridge. {T}: Add {G} to your mana pool. Put a depletion counter on Timberline Ridge