2011-09-22 : Any of the targeted cards that are illegal targets by the time Memory’s Journey resolves aren’t shuffled into their owner’s library.

2011-09-22 : If no cards were targeted by Memory’s Journey or if all the targeted cards are illegal targets by the time Memory’s Journey resolves, the targeted player will still shuffle their library.

2011-09-22 : If the player is an illegal target by the time Memory’s Journey resolves, the spell will have no effect, even if the cards are still legal targets. This is because a spell can’t make an illegal target (the player) perform any actions (such as shuffling their library).

2011-09-22 : If you cast Memory’s Journey with flashback, it won’t be in the graveyard when you choose targets. It can’t target itself.

2011-09-22 : You don’t have to target any cards when you cast Memory’s Journey, but you must target a player.