Timberline Ridge doesn't untap during your untap step if it has a depletion counter on it.
At the beginning of your upkeep, remove a depletion counter from Timberline Ridge.
{T}: Add {R} or {G}. Put a depletion counter on Timberline Ridge.
Near Mint - $1.40
Near Mint Non-English - $1.40
Lightly Played - $1.20
Lightly Played Non-English - $1.20
Played - $1.00
Played Non-English - $1.00
Heavily Played - $0.80
Heavily Played Non-English - $0.80
Damaged - $0.70
Damaged Non-English - $0.70