by Shanahan
Start of turn effects happen before you draw and are triggered by cards already in play. So if there are no environment cards in play, there's no start of turn effects. So if in that turn, in the Play phase, you flip the Volcano. You're in the Play phase now, so its Start of Turn effect doesn't happen until the next environment turn.[Ooops..David and I must have been replying at the same time!]