The Journal of Impossible Things can only be played during the Doctor's Card Phase, correct? He can't play it before he draw his 2 cards to start his turn, right?
Also, if the Master does not have a token on his current Regeneration, the Doctor essentially gets to play the journal for "free"? In other words, the Master doesn't have to have a token on the Regeneration card to play the Journal, right? The "if one is available", to me, could potentially be interpreted that the Doctor can only play the Journal "if a token is available", so just want to confirm.