In 2v2 games, can a player cast spells (like Falling Star) during their teammate's turn?

Ruling: The rules appear contradictory or ambiguous on this point. Rule 466.8.a suggests teammates can play spells during each other's turns, but rule 312 states only one player has permission to play permanents, which should be the turn player. Players should agree as a table on the interpretation.

Nuances:

• The intent seems to be that you can play spells but not permanents during your ally's action phase
• Rule 466.8.a may be leftover from a removed invite mechanic
• This contradiction should be clarified with Riot for tournament play