Memory's Journey

Sep 22, 2011 · You don't have to target any cards when you cast Memory's Journey, but you must target a player.

Sep 22, 2011 · 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.

Sep 22, 2011 · 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).

Sep 22, 2011 · If you cast Memory's Journey with flashback, it won't be in the graveyard when you choose targets. It can't target itself.

Sep 22, 2011 · Any of the targeted cards that are illegal targets by the time Memory's Journey resolves aren't shuffled into their owner's library.

Mar 19, 2021 · A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.

Mar 19, 2021 · You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.

Mar 19, 2021 · You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.

Mar 19, 2021 · "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."