What is the timing speed of Bloodharbor Ripper's activated ability?

Ruling: Bloodharbor Ripper's main ability ([1], [T]: Return a friendly unit at a battlefield to its owner's hand. Play a Gold gear token exhausted) is a standard activated ability, not action speed. It can only be activated during your own Main Phase in an Open State (when no chain exists and there is no showdown).

Nuances:

• The ability lacks the [Action] keyword, so it is not action speed—it follows standard activated ability timing restrictions.
• The Gold gear token created by this ability has a [Reaction] ability, which can be activated during Closed States on any player's turn.
• In Riftbound, "Action" is a specific keyword that modifies timing; abilities without this keyword follow standard timing rules.